How to get rid of Encoding::CompatibilityError?

Question

css

I'm writing in SASS Compiling Koala started giving this error after a reboot and doesn't compile anymore. Before that it worked fine.
Encoding::CompatibilityError on line ["93"] of C: incompatible character encodings: Windows-1251 and IBM866
Run with --trace to see the full backtrace

Answer 1

Somewhere a crooked symbol crept in.
Use your power Luke! Run with --trace to see the full backtrace