New Project Start Up Error in Android with Kotlin support


I created New Android Studio Project including Kotlin support and when the project build finished I got two errors at very beginning of the MainActivity as follows,

  1. Package Name Error: Package directive doesn’t match file location
  2. In onCreate at line setContentView(R.layout.activity_main) : Unresolved reference: R

I did followed all the setup steps according to the Android Studio 3.0 Canary setup docs.


The R problem could be resolved by compiling the app as the R file is generated and doesn’t actually exist before compilation. While android studio often simulates its generation sometimes this breaks (often because of resource issues). The package name error should have a quick fix for it, but if that is in a Kotlin file it should be a warning, not error.


Hi there,

I couldn’t solve the R problem. Ubuntu/Android Studio Canary 3.0 9

Which are the steps to fix it?

Thanks in advanced.

Best regards,



I got the same Error also but before this my application are working fine. I dont know what happend.How can i solve this problem?


I had the same problem. And the solution was to make the rebuild of the project.


  • Click build and then rebuild project.