Error: (24, 13) Failed to solve: com.android.support:appcompat-v7:20

Question

I am new to Android, I installed Android Studio 1.4.1 , I get the following errors. How can I solve this error?

Gradle Sync

Error:(24, 13) Failed to resolve: com.android.support:appcompat-v7:20.+
<a href="install.m2.repo">Install Repository and sync project</a><br><a href="openFile:C:/Users/Admin/AndroidStudioProjects/MyFirstApp/app/build.gradle">Show in File</a><br><a href="open.dependency.in.project.structure">Show in Project Structure dialog</a>  

Gradle Build

Error:A problem occurred configuring project ':app'.
> Could not resolve all dependencies for configuration ':app:_debugCompile'.
   > Could not find any matches for com.android.support:appcompat-v7:20.+ as no versions of com.android.support:appcompat-v7 are available.
     Searched in the following locations:
         https://jcenter.bintray.com/com/android/support/appcompat-v7/maven-metadata.xml
         https://jcenter.bintray.com/com/android/support/appcompat-v7/
     Required by:
         MyFirstApp:app:unspecified

build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 20
    buildToolsVersion "20.0.0"

    defaultConfig {
        applicationId "com.example.admin.myfirstapp"
        minSdkVersion 15
        targetSdkVersion 20
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:20.+'
}

Answer 1

Are you behind a firewall? You may need to do this in the build.gradle project:

repositories {
    jcenter {
        url "http://jcenter.bintray.com/"
    }
}

Answer 2

I had the same problem, my problem was that the user working on the studio android did not have rights affecting the Android root directory. In my case, I gave permissions to this directory using the command:

chdown -R myuser /opt/android-studio/