I have exported FontLab 5 fonts and successfully brought them into Glyphs, except that when I try to compile the OpenType code, I get the singularly unhelpful
The operation could not be completed. No other information is available about the problem.
Could the fact that the font includes double-encoded glyphs be the issue? If not that, what are other likely culprits? It has pretty complicated classes and features, but I’m not spotting any obvious errors.