Can't open .glyphspackage file

For some reason, I can’t open a .glyphspackage file (my Glyphs 3 is up to date).
It’s my first time with a .glyphspackage file (it was exported via Fontlab), when I click on it, it just says: “the file “…” can’t be openned”, don’t know if the file is corrupted or if I can try something, any idea?

Thank’s! :slight_smile:

Can you please send me the .glyphs file to support (at) (this website without ‘www’ or ‘forum’). I will have a look.

Thanks for the file. There are some invalid custom parameters in the master settings. I fixed it in Glyphs so that it can handle it.