How To Fix This Gradle App:dexdebug Error?

im using android studio,now in my app i have this error when i run my app Error:Execution failed for task ':app:dexDebug'. > com.android.ide.common.internal.LoggedErrorException

Solution 1:

You are using different version of the same library.

In your case, appcompat and support-v13 have the same dependency: support-v4.

You have to use the same version of support-v4.

I suggest you to change your dependency in:

dependencies {
   compile fileTree(dir: 'libs', include: ['*.jar'])
   compile'com.android.support:appcompat-v7:21.0.3'compile'com.android.support:support-v13:21.0.3'
}

and remove the android-support-v13.jar from the libs folder.