Start
Lower a
Traceback (most recent call last):
File "Make Unicase Font.py", line 21, in <module>
lowerGlyph.leftKerningGroup = upperGlyph.leftKerningGroup
File "GlyphsApp/__init__.py", line 3876, in <lambda>
File "GlyphsApp/__init__.py", line 453, in NSStr
ValueError: NSInvalidArgumentException - *** -[NSPlaceholderString initWithString:]: nil argument
End
I get this error every time: