Can´t export file, unkown error

i´m having trouble exporting my glyphs file after I added the letters äüöß!? i made sure that the names are the correct glyhs names but it still won`t work. Maybe somebody has a solution for the problem. Thank you in advance.

Can you send me the .glyphs file?

sorry wrong link, here is the right one. Thank you for the help.

There was a problem with the glyph name validation. Select the glyphs at the end of the file (ä, ö, ß …) and run “Glyph > Update Glyphs Info”.

Thank you so much. I tried updating the names before but i didnt now they had do be selected.
You saved my day!