[Android] The color "xxx" in values has no declaration in the base values folder; this can lead to crashes when the resource is queried in a configuration that does not match this qualifier less...

This error occurs usally when a project is copied.

The solution is simple as follows.

1. Build > Clean Project

2. File > Invalidate Caches / Restart

 

 

You can confirm the project is working fine after restarting Android Studio.