Error:Execution failed for task ':app.main:preBuild'. > Could not get unknown property 'libraries' for task ':app.main:processDebugManifest' of type com.android.build.gradle.tasks.MergeManifests.
我的android studio是3.1.1的,Could not get unknown property 'libraries' for task ':app.main:processDebugManifest' of type com.android.build.gradle.tasks.MergeManifests.