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I installed calysto_processing following the instructions in this repository, the execution of the kernel is fine, but when I save a notebook and reopen Jupyter show this error
TypeError: ext.toLowerCase is not a function
and the console says [MetaKernelApp] ERROR | No such comm target registered: jupyter.widget.version
thanks a lot
I have this installation
jupyter-notebook : 6.0.3
qtconsole : 4.7.4
ipython : 7.16.1
ipykernel : 5.3.1
jupyter client : 6.1.6
jupyter lab : 2.2.2
nbconvert : 5.6.1
ipywidgets : 6.0.0
nbformat : 5.0.7
traitlets : 4.3.3```
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