Keep getting an error with "crossfade clips"

It’s a bug: Crossfade Clips fails when Audacity is set to Deutsch (German) · Issue #5848 · audacity/audacity · GitHub

I posted the fix here but unless you are familiar with editing Audacity’s translations your best option will be to work around the issue.

Workarounds:

  1. Change the Audacity language settings. (English should work)
  2. Downgrade Audacity to an older version.