After researching the subject, I can say for sure that my font is too inconsistent to have hints, and I don’t have any overlap. So I can safely disable both options. But of course, I’m still getting this There was a problem converting the PostScript source font error. Isn’t there a way to find out more about the error?
Maybe this was a bug that was fixed in the recent cutting edge versions. Here is how to get it: Go to Glyphs > Preferences > Updates, activate both checkboxes and press the Update button.
Weird. I’m on the latest stable (Version 2.6.1 (1230)), and it will not export without Disable subroutines. I don’t know if it’s related but I’m on macOS Catalina beta 2.
That is the not supported. Remove Overlap and autohint can’t run on 10.15 and there tools are not tested yet. So I strongly advise not to you beta OSes for production work.