title: Failed to apply plugin Android Gradle plugin 3.0.0-alpha5 must not be applied to project
body: <p>Using the latest Android Studio 3.0 Canary 5</p>
  
  <p>Here's the error:</p>
  
  <p>Error:(1, 1) A problem occurred evaluating project ':app'.</p>
  
  <blockquote>
    <p>Failed to apply plugin [class 'com.android.build.gradle.api.AndroidBasePlugin']
    Android Gradle plugin 3.0.0-alpha5 must not be applied to project [path_to_my_project] since version 3.0.0-alpha5 was already applied to this project</p>
  </blockquote>
  
  <p>Tried: cleaning, rebuilding, opening/closing. Not working.</p>
  
  <p>any ideas ?</p>
  
  <p><strong>[LATER EDIT]</strong>
  Solution: Migrate to Canary 8+ and all should be ok.</p>