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android studio 3.0.1 and kotlin v1.2.10-release-Studio3.0-1 got issue

I am using android studio 3.0.1 and I was going to use Kotlin.
I wrote some simple code and when application runs the android studio shows me below error:
Error:Gradle:
A problem occurred configuring root project 'Firstapp1'.
Could not resolve all files for configuration ':classpath'.
Could not resolve com.android.tools.build:gradle:3.0.1.
Required by:
project :
Could not resolve com.android.tools.build:gradle:3.0.1.
Could not parse POM https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.0.1/gradle-3.0.1.pom
Already seen doctype.
Gradle version: 4.1
Android plugin version : 3.0.1
Please help me to solve this problem!

Make sure the kotlin version used in gradle and the kotlin plugin version are the same like in the following snaps:
Version in gradle is 1.1.51
Version of the plugin installed is also 1.1.51

i solved that problem.thanks.i have a new problem...
Error:Gradle: A problem occurred configuring root project 'Firstapp1'.
Could not resolve all files for configuration ':classpath'.
Could not resolve com.android.tools.build:gradle:3.0.1.
Required by:
project :
Could not resolve com.android.tools.build:gradle:3.0.1.
Could not parse POM https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.0.1/gradle-3.0.1.pom
Already seen doctype.
Could not resolve com.android.tools.build:gradle:3.0.1.
Could not get resource 'https://jcenter.bintray.com/com/android/tools/build/gradle/3.0.1/gradle-3.0.1.pom'.
Could not HEAD 'https://jcenter.bintray.com/com/android/tools/build/gradle/3.0.1/gradle-3.0.1.pom'.
Connect to jcenter.bintray.com:443 [jcenter.bintray.com/108.168.243.150] failed: Connection timed out: connect

Error while compiling multidex library after updating SDK

I am pretty new to Android Studio.
I have converted my Eclipse project to Android Studio successfully. everything worked fine, until today I updated my SDK and suddenly it started giving me error
> Error: A problem occurred configuring project ':app'.
> Could not resolve all dependencies for configuration ':app:_debugCompile'.
> Could not find com.android.support:multidex:1.0.1.
Searched in the following locations:
https://jcenter.bintray.com/com/android/support/multidex/1.0.1/multidex-1.0.1.pom
https://jcenter.bintray.com/com/android/support/multidex/1.0.1/multidex-1.0.1.jar
https://jitpack.io/com/android/support/multidex/1.0.1/multidex-1.0.1.pom
https://jitpack.io/com/android/support/multidex/1.0.1/multidex-1.0.1.jar
file:/C:/Users/as/AppData/Local/Android/sdk/extras/android/m2repository/com/android/support/multidex/1.0.1/multidex-1.0.1.pom
file:/C:/Users/as/AppData/Local/Android/sdk/extras/android/m2repository/com/android/support/multidex/1.0.1/multidex-1.0.1.jar
file:/C:/Users/as/AppData/Local/Android/sdk/extras/google/m2repository/com/android/support/multidex/1.0.1/multidex-1.0.1.pom
file:/C:/Users/as/AppData/Local/Android/sdk/extras/google/m2repository/com/android/support/multidex/1.0.1/multidex-1.0.1.jar
Required by:
ElalaSeller:app:unspecified
when I rebuild my project. it says
Error:(25, 13) Failed to resolve: com.android.support:multidex:1.0.1
Install Repository and sync project
Show in File
Show in Project Structure dialog
I checked Android support repository is installed.
Any help will be appreciated.
Thank you.
Update : I have checked this Question. most upvoted answer says install Android Support Repository. but in my case i already have installed it. you can see in screenshot i have uploaded. but still getting same error.
I have cleaned my project but still no change.

Error build Android in Cordova: Unspecified required by?

I'm trying to build my app in Cordova 5.4 using cordova run android. I'm getting this:
* What went wrong:
A problem occurred configuring root project 'android'.
> Could not resolve all dependencies for configuration ':_debugCompile'.
> Could not find any version that matches com.android.support:support-v4:+.
Searched in the following locations:
https://repo1.maven.org/maven2/com/android/support/support-v4/maven-metadata.xml
https://repo1.maven.org/maven2/com/android/support/support-v4/
Required by:
:android:unspecified
I can't seem to track this one down. Look familiar?

Sorry, if this should be a comment but I don't have enough points yet to do so.
Please try to install Android Support Repository in the Android SDK Manager.
Then check whether this works
cordova build android --verbose
If it's successful,
cordova run android --verbose
Source:
https://github.com/AzureAD/azure-activedirectory-library-for-cordova/issues/6

Check for android-support-v4.jar in your project build path.

error when creating new project in android studio

I'm new to android studio. I've created a new project with android studio, when I want to run it I've got this error :
Error:A problem occurred configuring project ':app'.
> Could not resolve all dependencies for configuration ':app:_debugCompile'.
> Could not find com.android.support:appcompat-v7:21.+
Searched in the following locations:
https://jcenter.bintray.com/com/android/support/appcompat-v7/21/appcompat-v7-21.pom
https://jcenter.bintray.com/com/android/support/appcompat-v7/21/appcompat-v7-21.jar
Required by:
myappname:app:unspecified
one thing that surprised me is that I opened this link:
https://jcenter.bintray.com/com/android/support
but this link is incorrect!
what is the cause of this error?
I have android support library installed:

Go to the SDK Manager and install "Extras|Android Support Repository"

Error:Failed to find: com.google.protobuf:protobuf-java:2.5 in Android Studio imported project

I imported an existing Android project in the Android Studio but it does not build because of this :
Error:A problem occurred configuring project ':appName'.
> A problem occurred configuring project ':myTracksLib'.
> Could not resolve all dependencies for configuration ':myTracksLib:_debugCompile'.
> Could not find com.google.protobuf:protobuf-java:2.5.
Searched in the following locations:
https://jcenter.bintray.com/com/google/protobuf/protobuf-java/2.5/protobuf-java-2.5.pom
https://jcenter.bintray.com/com/google/protobuf/protobuf-java/2.5/protobuf-java-2.5.jar
file:/Users/name/Library/Android/sdk/extras/android/m2repository/com/google/protobuf/protobuf-java/2.5/protobuf-java-2.5.pom
file:/Users/name/Library/Android/sdk/extras/android/m2repository/com/google/protobuf/protobuf-java/2.5/protobuf-java-2.5.jar
file:/Users/name/Library/Android/sdk/extras/google/m2repository/com/google/protobuf/protobuf-java/2.5/protobuf-java-2.5.pom
file:/Users/name/Library/Android/sdk/extras/google/m2repository/com/google/protobuf/protobuf-java/2.5/protobuf-java-2.5.jar
Required by:
AppName:myTracksLib:unspecified
How can I solve that? Project builds in Eclipse so I do not know why this is happening.
I have seen this but I do not know how it related to Android Studio or not.

According to the search function of Maven Central:
http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22com.google.protobuf%22%20AND%20a%3A%22protobuf-java%22
There's a 2.5.0 version, not 2.5. Try changing the version in your build script to 2.5.0.