runtime error

todict return obj.to_dict(validate=False, context=context) File "/home/user/.local/lib/python3.10/site-packages/altair/vegalite/v5/api.py", line 2975, in to_dict return super().to_dict( File "/home/user/.local/lib/python3.10/site-packages/altair/vegalite/v5/api.py", line 961, in to_dict vegalite_spec = super(TopLevelMixin, copy).to_dict( # type: ignore[misc] File "/home/user/.local/lib/python3.10/site-packages/altair/utils/schemapi.py", line 961, in to_dict result = _todict( File "/home/user/.local/lib/python3.10/site-packages/altair/utils/schemapi.py", line 477, in _todict return {k: _todict(v, context) for k, v in obj.items() if v is not Undefined} File "/home/user/.local/lib/python3.10/site-packages/altair/utils/schemapi.py", line 477, in <dictcomp> return {k: _todict(v, context) for k, v in obj.items() if v is not Undefined} File "/home/user/.local/lib/python3.10/site-packages/altair/utils/schemapi.py", line 473, in _todict return obj.to_dict(validate=False, context=context) File "/home/user/.local/lib/python3.10/site-packages/altair/utils/schemapi.py", line 961, in to_dict result = _todict( File "/home/user/.local/lib/python3.10/site-packages/altair/utils/schemapi.py", line 477, in _todict return {k: _todict(v, context) for k, v in obj.items() if v is not Undefined} File "/home/user/.local/lib/python3.10/site-packages/altair/utils/schemapi.py", line 477, in <dictcomp> return {k: _todict(v, context) for k, v in obj.items() if v is not Undefined} File "/home/user/.local/lib/python3.10/site-packages/altair/utils/schemapi.py", line 473, in _todict return obj.to_dict(validate=False, context=context) File "/home/user/.local/lib/python3.10/site-packages/altair/vegalite/v5/schema/channels.py", line 64, in to_dict raise ValueError( ValueError: Unable to determine data type for the field "category"; verify that the field name is not misspelled. If you are referencing a field from a transform, also confirm that the data type is specified correctly.

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