Red Arrow plug-in not working

I installed the RedArrow plug-in using the Plugin Manager but it crashes every time.
I get this error report

Details:
Traceback (most recent call last):

  File "~/Library/Application Support/Glyphs/Repositories/Red Arrow/RedArrow.glyphsReporter/Contents/Resources/plugin.py", line 4, in <module>
    import objc

ImportError: No module named objc

I’m using Version 2.6.8 (1361) of Glyphs on macOS Monterey Version 12.4

Any suggestions?

Please read this: Glyphs 2 on Monterey | Glyphs
Specially the part about pyobjc.

Thanks you!