Syntax error at “missing”

Hi there,
I get this syntax error when I try to export my font
The full error message in the terminal is this:

syntax error at “’” missing { GCLASS CID GNAME “-” “]” } [features.fea 63]

Try updating the features before you export.

What is at line 63 in the features.fea file?

I solved the problem. Thank you very much!

Can you tell what the problem was. Maybe I can add a better error message.