Develop Reference

Flutter: Unable to generate build files, A Required package was not found

Tried to build a basic linux app following the official Flutter google-colab tutorial and got stuck with this error
Launching lib/main.dart on Linux in debug mode...
lib/main.dart:1
CMake Error at /usr/share/cmake-3.22/Modules/FindPkgConfig.cmake:603 (message):
A required package was not found
Call Stack (most recent call first):
/usr/share/cmake-3.22/Modules/FindPkgConfig.cmake:825 (_pkg_check_modules_internal)
flutter/CMakeLists.txt:25 (pkg_check_modules)
Exception: Unable to generate build files`
OS: Linux Mint
IDE: VScode
Tried to find the missing modules so i could install. Was unsuccessful. Need more expertise in that part. Please help :)
edit: installed libgtk-3-dev since it was a requirement as stated from flutter doctor
which said
root#lax:/home/lax/Flutter/vibeo# flutter doctor
Woah! You appear to be trying to run flutter as root.
We strongly recommend running the flutter tool without superuser privileges.
/
📎
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.3.10, on Linux Mint 21.1 5.15.0-57-generic, locale en_IN)
Checking Android licenses is taking an unexpectedly long time...[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.1)
[✗] Chrome - develop for the web (Cannot find Chrome executable at google-chrome)
! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.
[✗] Linux toolchain - develop for Linux desktop
✗ GTK 3.0 development libraries are required for Linux development.
They are likely available from your distribution (e.g.: apt install libgtk-3-dev)
[✓] Android Studio (version 2021.3)
[✓] VS Code (version 1.74.2)
[✓] Connected device (1 available)
[✓] HTTP Host Availability
! Doctor found issues in 2 categories.
and still the build fails
Launching lib/main.dart on Linux in debug mode...
lib/main.dart:1
ERROR: Flutter failed to create a directory at "/home/lax/Flutter/vibeo/.dart_tool/flutter_build/a631d39312be8637492918f28fa31d2e".
Exception: Build process failed
Exited (sigterm)

Flutter Xcode iOS 'Flutter/Flutter.h' file not found

I have Mac and use Android studio and Xcode, I got the following error messages when I tried to run my Flutter app or when I tried to do Build -> Build iOS
I tried most solution I found in web like: pod install or remove pods files,,, and another solutions but did not helped me, How to fix? thanks
Could not build the precompiled application for the device.
Error (Xcode): 'Flutter/Flutter.h' file not found
/Users/test/StudioProjects/app/ios/Runner/GeneratedPluginRegistrant.h:9:8
Error (Xcode): failed to emit precompiled header '/Users/test/Library/Developer/Xcode/DerivedData/Runner-dmjvwbvrfekhkvanzgfshfxgayly/Build/Intermediates.noindex/PrecompiledHeaders/Runner-Bridging-Header-swift_3KZJBW1LQ4BLG-clang_3S6LL1PRJK0WS.pch' for bridging header '/Users/test/StudioProjects/app/ios/Runner/Runner-Bridging-Header.h'
Error launching application
And Flutter doctor here:
/Users/test/Downloads/flutter/bin/flutter doctor --verbose
[✓] Flutter (Channel stable, 2.10.1, on macOS 12.2.1 21D62 darwin-x64, locale sv-SE)
• Flutter version 2.10.1 at /Users/test/Downloads/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision db747aa133 (5 days ago), 2022-02-09 13:57:35 -0600
• Engine revision ab46186b24
• Dart version 2.16.1
• DevTools version 2.9.2
[!] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
• Android SDK at /Users/test/Library/Android/sdk
✗ cmdline-tools component is missing
Run `path/to/sdkmanager --install "cmdline-tools;latest"`
See https://developer.android.com/studio/command-line for more details.
✗ Android license status unknown.
Run `flutter doctor --android-licenses` to accept the SDK licenses.
See https://flutter.dev/docs/get-started/install/macos#android-setup for more details.
[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• CocoaPods version 1.11.2
[✗] Chrome - develop for the web (Cannot find Chrome executable at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome)
! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.
[✓] Android Studio (version 2021.1)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7590822)
[!] Connected device
! No devices available
[✓] HTTP Host Availability
• All required HTTP hosts are available
! Doctor found issues in 3 categories.
Process finished with exit code 0
Flutter -v
Manage your Flutter app development.
Common commands:
flutter create <output directory>
Create a new Flutter project in the specified directory.
flutter run [options]
Run your Flutter application on an attached device or in an emulator.
Usage: flutter <command> [arguments]
Global options:
-h, --help Print this usage information.
-v, --verbose Noisy logging, including all shell commands executed.
If used with "--help", shows hidden options. If used with "flutter doctor", shows additional diagnostic information. (Use "-vv" to force
verbose logging in those cases.)
--prefixed-errors Causes lines sent to stderr to be prefixed with "ERROR:".
--quiet Reduce the amount of output from some commands.
--[no-]wrap Toggles output word wrapping, regardless of whether or not the output is a terminal.
(defaults to on)
--wrap-column Sets the output wrap column. If not set, uses the width of the terminal. No wrapping occurs if not writing to a terminal. Use "--no-wrap" to
turn off wrapping when connected to a terminal.
-d, --device-id Target device id or name (prefixes allowed).
--version Reports the version of this tool.
--machine When used with the "--version" flag, outputs the information using JSON.
--[no-]color Whether to use terminal colors (requires support for ANSI escape sequences).
(defaults to on)
--[no-]version-check Allow Flutter to check for updates when this command runs.
(defaults to on)
--suppress-analytics Suppress analytics reporting when this command runs.
--packages Path to your "package_config.json" file.
Local build selection options (not normally required):
--local-engine-src-path Path to your engine src directory, if you are building Flutter locally.
Defaults to $FLUTTER_ENGINE if set, otherwise defaults to the path given in your pubspec.yaml dependency_overrides for sky_engine, if any.
--local-engine Name of a build output within the engine out directory, if you are building Flutter locally.
Use this to select a specific version of the engine if you have built multiple engine targets.
This path is relative to "--local-engine-src-path" or "--local-engine-src-out" (q.v.).
Options for testing the "flutter" tool itself:
--show-test-device List the special "flutter-tester" device in device listings. This headless device is used to test Flutter tooling.
--show-web-server-device List the special "web-server" device in device listings.
Available commands:
Flutter SDK
bash-completion Output command line shell completion setup scripts.
channel List or switch Flutter channels.
config Configure Flutter settings.
doctor Show information about the installed tooling.
downgrade Downgrade Flutter to the last active version for the current channel.
precache Populate the Flutter tool's cache of binary artifacts.
upgrade Upgrade your copy of Flutter.
Project
analyze Analyze the project's Dart code.
assemble Assemble and build Flutter resources.
build Build an executable app or install bundle.
clean Delete the build/ and .dart_tool/ directories.
create Create a new Flutter project.
drive Run integration tests for the project on an attached device or emulator.
format Format one or more Dart files.
gen-l10n Generate localizations for the current project.
pub Commands for managing Flutter packages.
run Run your Flutter app on an attached device.
test Run Flutter unit tests for the current project.
Tools & Devices
attach Attach to a running app.
custom-devices List, reset, add and delete custom devices.
daemon Run a persistent, JSON-RPC based server to communicate with devices.
debug-adapter Run a Debug Adapter Protocol (DAP) server to communicate with the Flutter tool.
devices List all connected devices.
emulators List, launch and create emulators.
install Install a Flutter app on an attached device.
logs Show log output for running Flutter apps.
screenshot Take a screenshot from a connected device.
symbolize Symbolize a stack trace from an AOT-compiled Flutter app.
Run "flutter help <command>" for more information about a command.
Run "flutter help -v" for verbose help output, including less commonly used options.

Here is some steps you can follow :-
cd.. your flutter project
run flutter clean
run your project iOS directory in Xcode
go to preferences-> Location and clear derive data
then run cd.. your_project_path/iOS in your terminal
then run pod install
then run your code in simulator using Xcode
Maybe it can solve your problem

Upgrade the Project dependencies to latest versions by running command
flutter pub upgrade
Go to iOS folder of the project run
pod init
and
pod install
I hope this solution solve your problem.
Please up the vote if this answer help you.

Flutter error: Could not load wrapper properties from /android/gradle/wrapper/gradle-wrapper.properties'

i am new to flutter, i just followed an online video on setting up flutter on my MacBook pro and i just created my first project and tried to run it while my system is connected to the internet but got this error bellow
Launching lib/main.dart on sdk gphone x86 arm in debug mode...
Running Gradle task 'assembleDebug'...
Exception in thread "main" java.lang.RuntimeException: Could not load wrapper properties from '/Users/bright/AndroidStudioProjects/second_flutterapp/android/gradle/wrapper/gradle-wrapper.properties'.
at org.gradle.wrapper.WrapperExecutor.<init>(WrapperExecutor.java:64)
at org.gradle.wrapper.WrapperExecutor.forWrapperPropertiesFile(WrapperExecutor.java:47)
at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:60)
Caused by: java.net.URISyntaxException: Illegal character in path at index 62: https://services.gradle.org/distributions/gradle-x.x.x-all.zip to gradle-6.7-all.zip
at java.net.URI$Parser.fail(URI.java:2848)
at java.net.URI$Parser.checkChars(URI.java:3021)
at java.net.URI$Parser.parseHierarchical(URI.java:3105)
at java.net.URI$Parser.parse(URI.java:3053)
at java.net.URI.<init>(URI.java:588)
at org.gradle.wrapper.WrapperExecutor.readDistroUrl(WrapperExecutor.java:81)
at org.gradle.wrapper.WrapperExecutor.prepareDistributionUri(WrapperExecutor.java:70)
at org.gradle.wrapper.WrapperExecutor.<init>(WrapperExecutor.java:57)
... 2 more
Exception: Gradle task assembleDebug failed with exit code 1
i have see many issues like this with answers here but non fixed my issue... i have tried deleting "gradle-wrapper.jar" and Replacing "distributionUrl=https://services.gradle.org/distributions/gradle-x.x.x-all.zip to gradle-6.4.1-all.zip" on the gradle-wrapper-properties file and running the comman "flutter run" on my terminal but still get same error
i have tried "flutter doctor" which gave me the result down bellow
Brights-MBP:~ bright$ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 1.22.5, on Mac OS X 10.15.6 19G2021 darwin-x64,
locale en-NG)
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[✗] Xcode - develop for iOS and macOS
✗ Xcode installation is incomplete; a full installation is necessary for iOS
development.
Download at: https://developer.apple.com/xcode/download/
Or install Xcode via the App Store.
Once installed, run:
sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
sudo xcodebuild -runFirstLaunch
✗ CocoaPods not installed.
CocoaPods is used to retrieve the iOS and macOS platform side's plugin
code that responds to your plugin usage on the Dart side.
Without CocoaPods, plugins will not work on iOS or macOS.
For more info, see https://flutter.dev/platform-plugins
To install:
sudo gem install cocoapods
[✓] Android Studio (version 4.1)
[✓] Connected device (1 available)
! Doctor found issues in 1 category.
i know i have not installed Xcode which i will do later but am not sure if thats the issue
#what am i doing wrong?

Looking at the path, the error clearly stated that:
Caused by: java.net.URISyntaxException: Illegal character in path at index 62: https://services.gradle.org/distributions/gradle-x.x.x-all.zip to gradle-6.7-all.zip
When checking the file gradle-x.x.x-all.zip in services.gradle.org/ distributions/, it is not existing while the gradle-6.7-all.zip was found. So it could be a big factor that there was an error copying the distributions path. The proper file should be gradle-6.7-all.zip.
Also, you've mentioned that this was the first time Flutter was setup in your MacOS. With this, you can always check the guide from the Flutter documentation about macOS install for any missed steps/processes.

The error shows your characters in "distributionUrl=https://services.gradle.org/distributions/gradle-xxx-all.zip to gradle-6.4.1-all.zip"
Just change it to something like this:
enter image description here

ProcessException: Process timed out: when xode build Done Flutter app

After Xcode code build flutter run
ProcessException: Process timed out:
Command: /usr/bin/env xcrun xcodebuild -configuration Debug -quiet -workspace
Runner.xcworkspace -scheme Runner
BUILD_DIR=/Users/Huzeifah/Documents/flutter_development/test_app/build/ios
-sdk iphonesimulator -arch x86_64
SCRIPT_OUTPUT_STREAM_FILE=/var/folders/w8/nf0h0vbj01v4qz3wbk07fvnr0000gn/T/flu
tter_build_log_pipe.O5hXp2/pipe_to_stdout FLUTTER_SUPPRESS_ANALYTICS=true
COMPILER_INDEX_STORE_ENABLE=NO -showBuildSettings
All version information when run flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.17.1, on Mac OS X 10.15.3 19D76, locale en-PK)
[✗] Android toolchain - develop for Android devices
✗ Unable to locate Android SDK.
Install Android Studio from:
https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK
components.
(or visit https://flutter.dev/docs/get-started/install/macos#android-setup
for detailed instructions).
If the Android SDK has been installed to a custom location, set
ANDROID_SDK_ROOT to that location.
You may also want to add it to your PATH environment variable.
[✓] Xcode - develop for iOS and macOS (Xcode 11.4.1)
[!] Android Studio (not installed)
[✓] VS Code (version 1.45.1)
[✓] Connected device (1 available)
! Doctor found issues in 2 categories.
When I run flutter. Xocde build done then give the Error ProceesTimw out. Then I try every thing that i can try. I install new vwesion of Xcode 11.4.1 and flutter new version 1.17 stable enter image description here

For me, I had the same issue and resolved it by moving my project out of a folder that iCloud was backing up. I had moved to a place with slower wifi, so my project kept hanging. Now, it loads faster than it did before.
Credit here (iOS simulator not working or taking so much time in Flutter)

This usually happens when you update xcode to fix this use Flutter upgrade in your general terminal and go to your project code editor and run Flutter clean and run flutter run if you face any other issues let me know......

Dart in Android Studio. No device to run applicaton

I can't run application because there is no devices on the list.
I tried to create AVD and connect real device. I have installed curl, Android SDK path was set, flutter licenses were accepted. I have Ubuntu 16.04.4
Output of flutter run --verbose in projects directory :
flutter: command not found
I have flutter path:
$ export PATH=/home/joe/flutter/bin:$PATH
$ echo $PATH
/home/joe/flutter/bin:home/joe/flutter/bin:home/joe/flutter/bin:/home/joe/bin:/home/joe/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
Now I put path's to .bashrc and run source ~/.bashrc, did I put path's correct way ?
# set PATH so it includes user's private bin directories
export PATH=/home/joe/flutter/bin:$PATH
export ANDROID_HOME=$HOME/Android/SDK
export PATH=$PATH:$ANDROID_HOME/tools
After adding path's to .bashrc I run flutter doctor:
$ /home/joe/flutter/bin/flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[!] Flutter (Channel master, v0.5.7-pre.102, on Linux, locale en_US.UTF-8)
✗ Downloaded executables cannot execute on host.
See https://github.com/flutter/flutter/issues/6207 for more information
On Debian/Ubuntu/Mint: sudo apt-get install lib32stdc++6
On Fedora: dnf install libstdc++.i686
On Arch: pacman -S lib32-libstdc++5
[✗] Android toolchain - develop for Android devices
✗ Unable to locate Android SDK.
Install Android Studio from: https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.io/setup/#android-setup for detailed instructions).
If Android SDK has been installed to a custom location, set $ANDROID_HOME to that location.
[✓] Android Studio (version 3.1)
[!] IntelliJ IDEA Community Edition (version 2018.1)
✗ Flutter plugin not installed; this adds Flutter specific functionality.
[!] Connected devices
! No devices available
! Doctor found issues in 4 categories.

Can be easily fixed by setting project SDK to latest Android API.
Go to File
Project Structure
Under Project-SDK select the latest SDK installed(Example:- Android API 29 Platform).

You have to set an Environment variable.
You can check it here for Flutter SDK setup with Android Studio