Generating OTF "Autohinting" failure

Hello there
So I try to generate my font in OTF. But It fails and says:
“there was a problem autohinting the glyph: _cornerleft.serif”
BUT the test install and generating in TTF works fine!

Anyway I’m concerned about what I did wrong, or how could I fix this issue?
What did I do wrong with the “cornerleft.serif” and how could I fix it.

Corners can’t be hinted, since they are open paths. Set corners to non-exporting.

In general, set all glyphs to non-exporting that don’t have a unicode or are referenced by OpenType features.

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How are you adding your corner component glyphs to the font? If you add them with ⌘⇧G (Add Glyphs) and call it _corner.[something], the leading underscore should automatically make the glyph non-exporting, so this issue shouldn’t appear.

If you added the component in some other way that gave it a name that didn’t start with an underscore, it would by default be marked as exporting, and you’d have to manually set it to non-exporting.

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@SCarewe
That was the problem…

@kokoshneta
You’re right… Maybe I made these serifs in the wrong way.
(but I’m not sure, it was a long time ago)

Thank you guys!