How to slove error: package R does not exist

Im having trouble packing my “game” as an APK (android application).
As most errors seem to start, it worked yesterday and today it will not build.

Javac outputs 18 errors, all of them in and all them to do with “package R does not exist”

Any and all advice is welcome.

I have tried

  • deleting “Intermediate.Android”
  • Checking “full rebuild” in the project settings

see below for the output log
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