Problem saving after update to 4.2

Ellie

I recently updated from 4.0 to 4.2, but upon saving, am now getting this error message 'The document could not be saved. The file isn’t in the correct format.'

Output has

File "lib/fontObjects/doodleFont.pyc", line 283, in autoSave
  File "lib/fontObjects/doodleFont.pyc", line 202, in save
  File "/Applications/RoboFont.app/Contents/Resources/lib/python3.7/defcon/objects/font.py", line 896, in save
  File "/Applications/RoboFont.app/Contents/Resources/lib/python3.7/defcon/objects/font.py", line 933, in _saveInfo
  File "/Applications/RoboFont.app/Contents/Resources/lib/python3.7/defcon/objects/font.py", line 944, in saveInfo
  File "/Applications/RoboFont.app/Contents/Resources/lib/python3.7/fontTools/ufoLib/__init__.py", line 1289, in writeInfo
  File "/Applications/RoboFont.app/Contents/Resources/lib/python3.7/fontTools/ufoLib/__init__.py", line 189, in _writePlist
fontTools.ufoLib.errors.UFOLibError: 'fontinfo.plist' could not be written on <osfs '/Users/elliehenderson/Library/Autosave Information/Steppenwolf-Regular_97 (autosaved RoboFont-4).ufo'> because the data is not properly formatted: unsupported type: <class 'NoneType'>
Could not auto save
'fontinfo.plist' could not be written on <osfs '/Users/elliehenderson/Library/Autosave Information/Steppenwolf-Regular_97 (autosaved RoboFont-4).ufo'> because the data is not properly formatted: unsupported type: <class 'NoneType'>

Any ideas?

Ellie

@frederik Thank you - seems like the issue is now resolved!

frederik

conversation moved to the RoboFont Slack Community --> https://robofontcommunity.slack.com/archives/C03A6AYH6TE/p1655135673859439

frederik

The switching to a newer version is the causing this issue.

A plist cannot write None to the file.

you can search by validating your info object:

from fontTools.ufoLib import fontInfoAttributesVersion3, validateInfoVersion3Data

# get the current font
font = CurrentFont()
# get the info dict as a defcon object
info = font.info.asDefcon()

data = dict()
# loop over all possible info attributes
for attr in fontInfoAttributesVersion3:
    value = getattr(info, attr)
    if value is None:
        continue
    # stroke the attribute if the data is not None
    data[attr] = value

# print out the result
print(data)
# validate the info dict
validateInfoVersion3Data(data)

good luck!

SOLVED Problem saving after update to 4.2