Mekkablue 'Steal Metrics' not working

I run the script and no dialogue box comes up, basically does nothing at all! My Glyphs App is up-to-date (3.1.2).

I opened the macro panel when trying to run the script and this is the error it’s giving me:

Any help would be appreciated, doing this manually will be very painful.

I believe this is an issue with the Vanilla module. Go to WindowPlugin ManagerModules and un- and reinstall Vanilla. Then relaunch Glyphs.

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This fixed it! Thank you Florian, you are a hero!