KeyError fig.preview_interactive()

[JosephKarpinski]

Python 3.8.5 64-bit MacOS Big Sur VSCode 1.56.0

fig.preview_interactive()

KeyError                                  Traceback (most recent call last)
~/opt/anaconda3/lib/python3.8/site-packages/traitlets/traitlets.py in get(self, obj, cls)
    534         try:
--> 535             value = obj._trait_values[self.name]
    536         except KeyError:

KeyError: 'error'

During handling of the above exception, another exception occurred:

TypeError                                 Traceback (most recent call last)
<ipython-input-19-fb58d54e2615> in <module>
----> 1 fig.preview_interactive()

~/opt/anaconda3/lib/python3.8/site-packages/aas_timeseries/visualization.py in preview_interactive(self)
    486         from jupyter_aas_timeseries import TimeSeriesWidget
    487         tmpfile = tempfile.mktemp()
--> 488         self.save_vega_json(tmpfile, embed_data=True, minimize_data=True)
    489         widget = TimeSeriesWidget(tmpfile)
    490         return widget

~/opt/anaconda3/lib/python3.8/site-packages/aas_timeseries/visualization.py in save_vega_json(self, filename, embed_data, minimize_data, override_style)
    278         # simplicity otherwise any guessing while users add/remove layers is
    279         # tricky.
--> 280         yunit = self._guess_yunit() if self.yunit == 'auto' else self.yunit
    281 
    282         # Auto-assign colors if needed

~/opt/anaconda3/lib/python3.8/site-packages/aas_timeseries/visualization.py in _guess_yunit(self)
     86         # found.
     87         for layer in self._layers:
---> 88             for (data, colname) in layer._required_ydata:
     89                 return data.unit(colname)
     90         for view in self._views:

~/opt/anaconda3/lib/python3.8/site-packages/aas_timeseries/layers.py in _required_ydata(self)
    213     @property
    214     def _required_ydata(self):
--> 215         return [(self.data, self.column), (self.data, self.error)]
    216 
    217     @property

~/opt/anaconda3/lib/python3.8/site-packages/traitlets/traitlets.py in __get__(self, obj, cls)
    573             return self
    574         else:
--> 575             return self.get(obj, cls)
    576 
    577     def set(self, obj, value):

~/opt/anaconda3/lib/python3.8/site-packages/traitlets/traitlets.py in get(self, obj, cls)
    536         except KeyError:
    537             # Check for a dynamic initializer.
--> 538             default = obj.trait_defaults(self.name)
    539             if default is Undefined:
    540                 warn(

~/opt/anaconda3/lib/python3.8/site-packages/traitlets/traitlets.py in trait_defaults(self, *names, **metadata)
   1576 
   1577         if len(names) == 1 and len(metadata) == 0:
-> 1578             return self._get_trait_default_generator(names[0])(self)
   1579 
   1580         trait_names = self.trait_names(**metadata)

TypeError: 'NoneType' object is not callable

pip3 install aas-timeseries
Collecting aas-timeseries
  Downloading aas_timeseries-0.1b4-py2.py3-none-any.whl (419 kB)
     |████████████████████████████████| 419 kB 2.6 MB/s 
Collecting palettable
  Downloading palettable-3.3.0-py2.py3-none-any.whl (111 kB)
     |████████████████████████████████| 111 kB 4.6 MB/s 
Requirement already satisfied: matplotlib in ./opt/anaconda3/lib/python3.8/site-packages (from aas-timeseries) (3.4.1)
Requirement already satisfied: astropy in ./opt/anaconda3/lib/python3.8/site-packages (from aas-timeseries) (4.2.1)
Collecting jupyter-aas-timeseries
  Downloading jupyter_aas_timeseries-0.1.7-py2.py3-none-any.whl (703 kB)
     |████████████████████████████████| 703 kB 3.7 MB/s 
Requirement already satisfied: traitlets in ./opt/anaconda3/lib/python3.8/site-packages (from aas-timeseries) (5.0.5)
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Installing collected packages: palettable, jupyter-aas-timeseries, aas-timeseries
Successfully installed aas-timeseries-0.1b4 jupyter-aas-timeseries-0.1.7 palettable-3.3.0

[tryingastronomy]

I had the same problem while running in Jupyter notebook (python 3.9) I was able to solve it with clearing my widgets and restarting the kernel. (Widgets -> Clear Notebook Widget State)

Hope this helps.