title: Java.lang.ClassNotFoundException: Didn't find class Kotlin
body: <p><a href="https://i.stack.imgur.com/gH5ox.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gH5ox.png" alt="This always appear after changing the code I rebuild the project and everything goes fine"></a>
  Every time I change my code and run it, this appear and the second time I run the code, it doesn't appears, what is the cause of this bug ?</p>