Android Studio: disabling “External build” to display error output create duplicate class errors

Question

I am starting my migration from Eclipse to Android Studio, and start playing with new projects on Studio.

My test project was working fine till I got some errors mes

Answer 1

I've found a question like this that has some replies here:

Cannot resolve R.java, duplicate class

You can try this:

• Delete the Build folder generated by Android Studio automatically

Also you can try to Rebuild project by clicking Build->Rebuild project after deleting build folder.