title: gradle4.5 compile error: Cannot add task
body: <p>I use the productFlavors </p>
  
  <p><a href="https://i.stack.imgur.com/CSlfB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CSlfB.png" alt="i"></a></p>
  
  <p>returns error </p>
  
  <blockquote>
    <p>Cannot add task ':app:reportSourceSetTransformTest' as a task with that name already exists.</p>
  </blockquote>
  
  <p>at gradle 4.4 or earlier version doesn't have this problem.
  When I updated it to gradle 4.5 yesterday, it returns error, clean project is the same problem. Why?</p>
  
  <p>android studio version:3.2 canary 3</p>
  
  <p><a href="https://i.stack.imgur.com/GXnU6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GXnU6.png" alt="e"></a></p>