Develop Reference

Android Studio 3.0.1 Error: Gradle project sync failed. Basic functionality (e.g. editing, debugging) will not work properly

I've installed Android studio 3.0.1 then tried to build very first app by choosing an empty activity, but I've got this message:
Gradle project sync failed. Basic functionality (e.g. editing, debugging) will not work properly
and the error message like this:
Unable to resolve dependency for ':app#releaseUnitTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:26.1.0.
Could not resolve com.android.support:appcompat-v7:26.1.0.
Required by:
project :app
Could not resolve com.android.support:appcompat-v7:26.1.0.
> Could not parse POM https://dl.google.com/dl/android/maven2/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.pom
> Already seen doctype.
The first part of log message is like this:
2018-01-03 11:11:12,671 [d thread 8] WARN - ect.sync.idea.ProjectSetUpTask - Already seen doctype.
Consult IDE log for more details (Help | Show Log)
2018-01-03 11:11:12,671 [d thread 8] INFO - e.project.sync.GradleSyncState - Gradle sync failed: Already seen doctype.
I've tried some suggested solutions like changing gradle version, update Kotlin plugin(!) and so, but they didn't work.
Any solution?

This problem occurs when the Build Tools Version is not set for the project.
You just set the build tools version by following this process...
By opening your project structure [File->Project Structure] and selecting the Build Tools Version from app's property tab in Modules section.
This will add build tools version to your gradle file (Module:app) and re-sync the project.

The problem caused by my connection. I needed to set proxy to download some components.

For me the issue was one of the external libraries required SDK 28 but android studio didnt have it so it did not work. I installed SDK 28 and the problem was fixed. I saw the problem in the log file it generated

The error happens under fluctuating network. So at first make sure your connection is stable. Plus, if you are using any VPN check your gradle.properties is configured correctly.
The correct form of VPN connection on gradle.properties is as follows,
systemProp.http.proxyHost=127.0.0.1
systemProp.http.proxyPort=8080
systemProp.https.proxyHost=127.0.0.1
systemProp.https.proxyPort=8080
My host connection is 127.0.0.1, and its port is 8080 for both http and https.
Just one more thing, make sure adding https (It is mandatory).

I had the same problem when i was upgrading to android studio 3.1.2 and the problem i was using the previous JDK which i installed before 5 years back.
The steps:-
Go to File -> Project Structures -> SDK Location -> JDK Location -> check the
Option Use embedded JDK (recommended).

I tried all suggestions, only one works for me:
open 'Gradle' tab on right vertical panel
right click on project name
'Refresh Gradle Dependencies' and wait background downloading
right click on project name again
'Reload Gradle Project' and wait refreshing

I was also stuck with the same issue for quite few minutes till I figured out the solution:
So you have to visit Gradle Releases and
there scroll down a little bit and you will find the plugin version and required gradle version. Make sure you use the latest version of both or the ones which are compatible with each other.
For today I am using :
Android Gradle Plugin Version - 7.0.2
Gradle Version - 7.2
You can update it by navigating to:
> File -> Project Structure -> Project

Suddenly My Project showing this Error(Gradle project sync failed. Basic functionality (e.g. editing, debugging) will not work properly). Then i Try to various solutions but not solved.
Then i close the android studio, and open the project location and delete the .idea and .iml file, After deleting this file open the project again on Android studio, after that the project working fine.

I had the same problem, I did download gradle version and used it as a local distribution.
Settings/Build,../Gradle/Use local distribution.
Else you will have to reinstall all the software.

The solution is kinda of very simple.
It's because the "compileSdkVersion" that you are using
in your build.gradle (Module:app) is higher than the SDK installed in your Android studio.
Now, what to do?
Just go on SDK Manager and download an Api Level higher or equal to your "compileSdkVersion" and you're done

Look at the manifest, something may have to go wrong there. In my case I had this label
<uses-sdk android: minSdkVersion = "7" android: targetSdkVersion = "15" />, which was from an example.
Then the error is displayed, and the correspondent is now updated <uses-sdk android: minSdkVersion = "15" android: targetSdkVersion = "27" />

As #oyeraghib said,
Visit this link to check the compatibility of your Android Gradle Plugin in comparison with Gradle itself. I was using an older version of both and updated to version 7 in both.
File -> Project Structure -> Project
It may take a while. Wait for it to load.

change the grade version to the latest one in gradle-wrapper

Gradle project sync failed. Basic functionality (e.g. editing, debugging) will not work properly
Go to gradle scripts -> build gradle(app) -> made following changes:
Finally it works.

Android Studio build fails with "Task '' not found in root project 'MyProject'."

I get this error when trying to build my project after changing laptop and updating to Android Studio version 0.8.2.
FAILURE: Build failed with an exception.
What went wrong:
Task '' not found in root project 'MyProject'.
Try:
Run gradle tasks to get a list of available tasks. Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
Here are my Gradle files:
Top Level settings.gradle
include ':MyProject'
build.gradle in MyProject:
apply plugin: 'com.android.application'
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath "com.android.tools.build:gradle:0.12.+"
}
}
repositories {
mavenCentral()
}
android {
compileSdkVersion 20
buildToolsVersion "20"
defaultConfig {
minSdkVersion 14
targetSdkVersion 20
}
}
dependencies {
compile 'de.timroes.android:EnhancedListView:0.3.0#aar'
compile 'com.nineoldandroids:library:2.4.0'
}
Top level build.gradle is empty

Though late in answering, this is a hard one to Google (the single quotes) and it’s not clear what’s happening. I don't have the reputation yet to comment or ask for scope (or post 3 links), so this answer may be a little tedious.
To answer fast, you may have multiple Gradle plugins in your project.
Synchronize Gradle Wrapper and Plugins
My issue seemed to start with a corrupted IML file. Android Studio (between closing and reopening a project) began complaining an IML was gone (it wasn’t) and a module should be deleted, which I declined. It persisted, I upgraded to AS 0.8.7 (canary channel) and got stuck on the OP issue (Task '' not found in root project). This completely blocked builds so I had to dig in to Gradle.
My repair steps on OSX (please adjust for Windows):
Upgrade Android Studio to 0.8.7
Preferences | Updates | Switch "Beta Channel" to "Canary Channel", then do a Check Now.
You might be able to skip this.
Checked the Gradle wrapper (currently 1.12.2; don’t try to use 2.0 at this time).
Assuming you don’t need a particular version, use the latest supported distribution
$ vi ~/project/gradle-wrapper.properties ... distributionUrl=http\://services.gradle.org/distributions/gradle-1.12-all.zip
This can be set in Android Studio at Preferences | Gradle (but 0.8.7 was giving me ‘invalid location’ errors).
The 'wrapper' is just a copy of Gradle for each Android Studio project. It allows you to have Gradle 2 in your OS, and different versions in your projects. The Android Developer docs explain that here.
Then adjust your build.gradle files for the plugin. The Gradle plugin version must be compatible with the distribution/wrapper version, for the whole project. As the Tools documentation (tools.android.com/tech-docs/new-build-system/user-guide#TOC-Requirements) is slightly out of date, you can set the plugin version too low (like 0.8.0) and Android Studio will throw an error with the acceptable range for the wrapper.
Example, in build.gradle, you have this plugin:
dependencies {
classpath "com.android.tools.build:gradle:0.12.+"
}
You can try switching it to the exact version, like this:
dependencies {
classpath "com.android.tools.build:gradle:0.12.2"
}
and (after recording what version you’re changing from in each case) verifying that every build.gradle file in your project pulls in the same plugin version. Keeping the “+” should work (for 0.12.0, 0.12.1, 0.12.2, etc), but my build succeeded when I updated Google’s Volley library (originally gradle:0.8.+) and my main project (originally 0.12.+) to the fixed version: gradle:0.12.2.
Other checks
Ensure you don’t have two Android Application modules in the same Project
This may interact with the final solution (different Gradle versions, above), and cause
UNEXPECTED TOP-LEVEL EXCEPTION: com.android.dex.DexException: Multiple dex files define (various classes)
To check, Build | Make Project should not pop up a window asking what application you want to make.
Invalidate your caches
File | Invalidate Caches / Restart (stackoverflow.com/a/19223269/513413)
If step 2 doesn't work, delete ~/.gradle/ (www.wuttech.com/index.php/tag/groovy-lang-closure/)
Quit Android Studio
$ rm -rf ~/.gradle/
Start Android Studio, then sync:
Tools | Android | Sync Project with Gradle Files
Repeat this entire sequence (quit...sync) a few times before giving up.
Clean the project
Build | Clean Project
Project structure mismatch; see https://stackoverflow.com/a/64962359/8740349 for details.
If You See This...
In my recent builds, I kept seeing horrible fails (pages of exceptions) but within seconds the messages would clear, build succeeded and the app deployed. Since I could never explain it and the app worked, I never noticed that I had two Gradle plugins in my project. So I think the Gradle plugins fought each other; one crashed, the other lost its state and reported the error.
If you have time, the 1-hour video "A Gentle Introduction to Gradle" (www.youtube.com/watch?v=OFUEb7pLLXw) really helped me approach the Gradle build files, tasks, build decisions, etc.
Disclaimer
I'm learning this entire stack, on a foreign OS, after working a different career...all at the same time and under pressure. In the last few months I have hit every wall I think Android has; I've been here quite often and this is my first post. I thought this was a hard fix, so I sincerely apologize if the quality of my answer reflects the difficulty I had in getting to it.

Download system image(of targeted android level of your project) from sdk manager for the project you have imported.
This error comes when you do not have target sdk of your android project installed in sdk folder
for eg. Your imported project's target sdk level may be android-19 and on sdk folder->system-images you may have android-21 installed. so you have to download android-19 system image and other files from sdk manager or you can copy paste it if you have the system image.

Remove:
<facet type="android" name="Android">
<configuration />
</facet>
in your iml file. That works for me.
https://plus.google.com/+AlexRuiz/posts/49hP3V9GSGe

This happened to me recently when I close one Android Studio project and imported another Eclipse project. It seemed to be some bug in Android Studio where it preserves some gradle settings from previously open project and then get confused in the new project.
The solution was extremely simple: Close the project and shut down Android Studio completely, before re-opening it and then import/open the new project. Everything goes smoothly from then on.

Apparently this error has multiple causes. Here's what fixed it for me.
I was running the build command like this:
./gradlew :testapp: build
Running it without the space fixed the issue:
./gradlew :testapp:build

I got this error when switching from one Git branch to another, and then trying to run "Clean Project". I used ack to search for the Task name, and found it in a .iml file.
My solution was to regenerate the project's .iml file by clicking (in the main menu) Tools > Android > Sync Project with Gradle Files. (Thanks to this answer.)

In my case, setting the 'Gradle version' same as the 'Android Plugin version' under File->Project Structure->Project fixed the issue for me.

Simple fix for me was
Build > Clean project
Restart Android Studio

Yet another solution to the same problem:
This happened to me every time I imported an eclipse project into studio using the wizard (studio version 1.3.2).
What I found, quite by chance, was that quitting out of Android studio and then restarting studio again made the problem go away.
Frustrating, but hope this helps someone...

Sometimes, if you have opened two windows of Android Studio, and when you try to compile, this issue might happen. For me, when I was compiling a backed Google Cloud Endpoint module which was not embedded in a project, rather shared among different Android Studio projects, and when there is more than once instance open, this error use to spring up for me. But as soon as you close other windows, everything will be fine. Sometimes, you might have to restart Android Studio altogether.

I got this problem because it could not find the Android SDK path. I was missing a local.properties file with it or an ANDROID_HOME environment variable with it.

Make sure you have the latest values in your gradle files. As of this writing:
buildToolsVersion "21.1.2"
dependencies {
classpath 'com.android.tools.build:gradle:1.1.0'
}

Open Command Prompt
then go your project folder thru Command prompt
Type gradlew build and run

Apparently this issue caused by Android Studio on the various situation but the reason is build error When importing an existing project into android studio. In my case, I've imported my exist project where I was supposed to install few build tools then finally build configuration was done with error. In this case, just do the following things
Close the current project
File>New>Import Project (Don't use the open recent project)
Note:
I'm sure this kind of error is not on source code when this happened on Import project.

Problem
I specifically got the "[module_name]:prepareDebugUnitTestDependencies" task not found error, every time I ran gradle build. This happened to me after updating my Android Studio to 3.0.0.
Investigation
I had previously added command-line options to the gradle-based compiler, which you can find under: File -> Settings -> Build, Execution, Deployment -> Compiler -> Command-line Options. Specifically, I had excluded a number of tasks, including the aforementioned task. While that worked fine on the previous stable version (2.3 at that time), it seems like this was the reason behind the build failure.
Solution
This is one of many possible solutions.
Make sure you have the correct command-line options specified in the settings under: File -> Settings -> Build, Execution, Deployment -> Compiler -> Command-line Options, and that none of them is causing this problem.
In my case, I removed the exclusion of this task (and other tasks that seemed related), left the unrelated tasks excluded, and it worked!

I had the same problem and the "Tasks" tab doesn't appear to me on the Gradle settings, neither doing the commands gradlew signinReport or something.
I fix it doing the following steps:
1.- Add android: exported = "true" in my main activity of the AndroidManifest (because that Activity has an intent-filter)
2.- Update in Build.gradle (app) the compileSdkVersion to 31
3.- Update in the same place the targetSdkVersion also to 31.
4.- Click on "Sync now".
And that works for me.
Farewell!

For this you may simply just goto: SETTINGS > EXPERIMENTAL > Then uncheck the option:
"Do not build Gradle Task List during Gradle sync", Click on "Apply" > "Ok" and then click on the "Sync Project with Gradle files" option from the right side of the menu bar.
Your issue should be resolved.

Set the path of the root folder and after run the below command
ex : cd C:\Users\maha\Documents\gradle\gs-gradle-master\initial

This is what I did
Remove .idea folder
$ mv .idea .idea.bak
Import the project again

I remove/Rename .gradle folder in c:\users\Myuser\.gradle and restart Android Studio and worked for me

In my case, I meet this problem that compile options in Android Studio is "stacktrace." Modify stacktrace to --stacktrace, the problem solved.

I have solved this problem You just need to Create file in Android Folder
Go android folder
Create file local.properties
then just add this code in local.properties file:-
If you are using MacBook then sdk.dir=/Users/USERNAME/Library/android/sdk
if you are using Windows then sdk.dir=C:\Users\USERNAME\AppData\Local\Android\sdk
if you are using Linux then sdk.dir = /home/USERNAME/Android/sdk
if you want to know what is your system USERNAME then just use command for Mac whoami
and then just rerun command react-native run-android
Thanks :)

Am on Mac so answer is as per like that.
Go to Android Studio(From Menu Bar) -> Preferences -> Build, Execution, Deployment -> Compiler . Then look for Command-Line Options , there make sure nothing typed in its Text Field. That should be empty. Then rebulid project and thats it.

Android Studio - Gradle sync project failed

In Android Studio, I simply created a new project, and it says that:
Gradle project sync failed. Basic functionality will not work properly.
I have searched the web and tried everything, but nothing worked. I have v0.4.6 of Android Studio using Gradle 1.11.
The Error Message Is:
FAILURE: Build failed with an exception.
* Where:
Build file 'C:\Users\Vinnie\AndroidStudioProjects\MyFirstAppProject\MyFirstApp\build.gradle' line: 9
* What went wrong:
A problem occurred evaluating project ':MyFirstApp'.
> Gradle version 1.10 is required. Current version is 1.11. If using the gradle wrapper, try editing the distributionUrl in C:\Users\Vinnie\AndroidStudioProjects\MyFirstAppProject\MyFirstApp\gradle\wrapper\gradle-wrapper.properties to gradle-1.10-all.zip
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
Total time: 1 mins 7.011 secs

The Android plugin 0.8.x doesn't support Gradle 1.11, you need to use 1.10.
You can read the proper error message in the "Gradle Console" tab.
EDIT
You need to change gradle/wrapper/gradle-wrapper.properties file in this way:
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=http\://services.gradle.org/distributions/gradle-1.10-all.zip

In my case NDK location was the issue.
go to File->Project Structure->SDK Location and add NDK location

This may be helpful for some.
My problem exactly is incomplete gradle-1.12-all file download.
Below is screen shot of the Error
I re-downloaded the file from the gradle site here and extracted it in path/to/the/gradle, in my case was in C:\Users\maneeOsman\.gradle\wrapper\dists\gradle-1.12-all\2apkk7d25miauqf1pdjp1bm0uo
I closed the android studio and reopen it in administrator privilege (Run as administrator).
The android studio starts downloading the necessary files for building and debugging. You can notice that from bottom-left indicator bar.
After this, it is working fine.
See the screen shot below

Here is the solution I found: On the project tree "app", right click mouse button to get the context menu. Select "open module setting", on the tree "app" - "properties" tab, select the existing "build tools version" you have. The gradle will start to build.

I have encountered this problem And I solved it as follows: File->Sync Project with Gradle Files
good luck!

After applying this fix that was found here... https://code.google.com/p/android/issues/detail?id=208295
in file $SDK/ndk_bundle/source.properties replace "12.0.2753695 beta 1" to "12.0.2753695-beta1"
My project was built successfully and ran on device and emulators although 5 warnings still remains.

Remove the dependency "junit:junit:4.12" from app modules...!!! This solution is for gradle to sync all files.

it was hard to solve but i did it
look go to
C:\Users\Vinnie\
delete .gradle file
its you didn't see it it may be in hidden files so if you use windows 7
right click then click on properties and click on hidden to be not checked
then the file will appear then delete it
i hope this works

I know this is an old thread but I ended up here with the same issue.
I solved it by comparing the dependencies classpath in the build.gradle script(Project) to the installed version.
The error message was pointing to the following folder
C:\Program Files\Android\android-studio3 preview\gradle\m2repository\com\android\tools\build\gradle
It turned out that the alpha2 version was installed but the classpath was still pointing to alpaha1. A simple change to the classpath ('com.android.tools.build:gradle:3.0.0-alpha2') was all that was needed.
This may not help everyone, but I do hope it help most people out.

I was behind firewall|proxy.
In my case with Studio, ERROR: Gradle sync failed & Cannot find symbol.
I have used
repositories {
jcenter(); // Points to HTTPS://jcenter.bintray.com
}
Replace it with http and maven
repositories {
maven { url "http://jcenter.bintray.com" }
}

i had same issue i solved by changing gradle plugin version and and gradle version
see image for more refrence

Use this line to your Build gradle app
repositories {
maven { url "http://jcenter.bintray.com" }}

Using an outdated gradle version may also result to fail in synchronization.
Download latest version from https://gradle.org/releases/ and download the "complete" latest version.
Now replace it with the outdated version which is located C:\Program Files\Android\Android Studio\gradle.
Go to settings(ctrl+alt+s) ,go to gradle and add the the new gradle directory in "use local gradle distribution" "Gradle home:C:\Program Files\Android\Android Studio\gradle\gradle4.4.1 ."
It Worked for me.
Hope u understand.

Update for 2018:
I have faced this issue recently and it was resolved by updating android studio & updating gradle when prompted then rebuilding the project

I had a "Install build tools and sync" link in the lower right hand corner of my screen. I clicked on that and it fixed the issue.

Each version of the Android Gradle Plugin now has a default version of the build tools. For the best performance, you should use the latest possible version of both Gradle and the plugin.
You recive this warning in case if you use latest gradle plugin but not use latest SDK version. For example for Gradle plugin 3.2.0 (September 2018) you requires Gradle 4.6 or higher and SDK Build Tools 28.0.3 or higher.
Although you typically don't need to specify the build tools version, when using Android Gradle plugin 3.2.0 with renderscriptSupportModeEnabled set to true, you need to include the following in each module's build.gradle file: android.buildToolsVersion "28.0.3"
see more https://developer.android.com/studio/releases/gradle-plugin

Update gradle to the latest available version and implement libraries to the latest version available, also check if google play services is latest if used.

Can't open Android samples using Android Studio

I just started using Android Studios and wanted to look at some of the sample code that Google already provides in their apk samples.
However, when I try importing a project, it tells me:
"You are using an old, unsupported version of Gradle. Please use version 1.8 or greater.
Please point to a supported Gradle version in the project's Gradle settings or in the project's Gradle wrapper (if applicable.)
Consult IDE log for more details (Help | Show Log)"
In my .gradle/wrapper/dists, I have gradle-1.6-bin and gradle-1.8-bin.
I tried updating the gradle to 1.8 from 1.6 in the gradle-wrapper.properties file in the project itself, but I can't seem to save the file after editing it.

Step 1: Change line in build.gradle:
dependencies {
classpath 'com.android.tools.build:gradle:0.6.+'
}
Step 2:
In the YourProject.iml file, delete the entire component name="FacetManager" tag.
Step 3
(Maybe not necessary): In the Android SDK manager, install (if not already installed) Android Support Repository under Extras.
Refer to these 2 links. It answers your question.
getting error when importing project in android studio?
Unable to import Eclipse project to Android Studio

getting error when importing project in android studio?

Recently i updated my android studio to 0 .30 I was trying to import project in android studion.
Project is using an old version of the Android Gradle plug-in. The minimum supported version is 0.6.1.
Please update the version of the dependency 'com.android.tools.build:gradle' in your build.gradle files.
Consult IDE log for more details (Help | Show Log)
2nd error
You are using an old, unsupported version of Gradle. Please use version 1.8 or greater.
Please point to a supported Gradle version in the project's Gradle settings or in
the project's Gradle wrapper (if applicable.)
Consult IDE log for more details (Help | Show Log
3rd error
Could not execute build using Gradle distribution '
http://services.gradle.org/distributions/gradle-1.6-bin.zip'.
Build file 'C:\Users\Asthme\crushersblue1\babies\build.gradle' line: 8
Could not find method classpath() for arguments
[com.android.tools.build:gradle:0.6.+] on project ':crushersblue1:babies'.
Consult IDE log for more details (Help | Show Log)

Step 1: Change line in build.gradle from:
dependencies {
classpath 'com.android.tools.build:gradle:0.6.+'
}
Step 2:
In the YourProject.iml file, delete the entire component name="FacetManager" tag.
Step 3
(Maybe not necessary): In the Android SDK manager, install (if not already installed) Android Support Repository under Extras.
Refer this

I was able to fix this by using the file path to my gradle directory:
C:\Users\xxxx.gradle\wrapper\dists\gradle-1.12-all\2apkk7d25miauqf1pdjp1bm0uo\gradle-1.12
the import continued fine.

This is duplicate of Unable to import Eclipse project to Android Studio (when using default gradle wrapper)
Answer:
I had to edit the gradle wrapper settings in
gradle/wrapper/gradle-wrapper.properties and change gradle version
to 1.8.
./gradle/wrapper/gradle-wrapper.properties :
#Wed Apr 10 15:27:10 PDT 2013
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=http\://services.gradle.org/distributions/gradle-1.8-bin.zip
I had to change gradle-1.6-bin.zip to gradle-1.8-bin.zip. I guess
the old ADT plugin from eclipse which generates this file still uses
the old URL.

If all the other solutions here do not work (they are all from 3 days ago)... I found...
I had secondary project in my settings.gradle and each of those projects had their own build.gradle. The Android Studio IDE says that you need to uddate to 0.6.1 but it points to only the first-project build.gradle - I had to manually locate the secondary build.gradle file for those projects and make sure all said 0.6.+ instead of previous versions.

Change gradle to 0.6.+ as ling has suggested, and also in your gradle-wrapper.properties file, change the distributionUrl to http\://services.gradle.org/distributions/gradle-1.8-bin.zip.