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These errors are usually caused by hide_code's server extension not being loaded. Check Jupyter's console on start up. You should see:
[I 16:30:29.153 NotebookApp] hide_code: Attempting to load hid_code export handler extensions. [I 16:30:29.154 NotebookApp] hide_code: Hide_code export handler extensions loaded.
If the above lines are missing, verify the server extension is enabled with jupyter nbextension list. You should see:
jupyter nbextension list
hide_code/hide_code enabled - Validating: OK