title: Why am I getting Execution error `Could not find property` bootClasspath
body: <p>I'm getting this error:</p>
  
  <pre><code>Error:Execution failed for task ':ProjectName:compileUniversalDebugJava'.
  &gt; Could not find property 'bootClasspath' on com.android.build.gradle.AppExtension_Decorated@26fd94a1.
  </code></pre>
  
  <p>Why is that?</p>
  
  <p>I'm building Android app with gradle on Android Studio.</p>