I generated a UFO out of a glyphs source (tried the UFO export in GlyphsApp and converting with glyphsLib)

Both times I fail to test install with the following error:

Failed to generate the font for test install
Traceback (most recent call last):
  File "lib/doodleDelegate.pyc", line 200, in testInstallFont_forWindow_showProgress_option_
  File "lib/fontObjects/doodleFont.pyc", line 300, in generate
  File "lib/fontObjects/doodleLayer.pyc", line 384, in generate
  File "/Applications/RoboFont.app/Contents/Resources/lib/python3.7/fontCompiler/compiler.py", line 147, in generateFont
  File "/Applications/RoboFont.app/Contents/Resources/lib/python3.7/fontCompiler/baseCompiler.py", line 379, in compile
UnicodeEncodeError: 'ascii' codec can't encode character '\xe4' in position 16: ordinal not in range(128)

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Installing This Font Bold failed
The file does not exist at the specified URL.
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The files are a bit messy (I'm only doing the mastering and production) so I can't really say what was going on with the files before.

I solved the problem by copying everything (Contours, Components, Anchors, Metrics, Groups, Kerning and Features) to a new UFO, but I’m still curious what the reason of this error was.

It only solved the problem until I also filled in the font infos.

UnicodeEncodeError: 'ascii' codec can't encode character '\xe4' in position 16: ordinal not in range(128)

The font name had an /ä in it which it did not like.
So I'll have to work with a localised name table I guess.

and present in the upcoming beta

thanks!