nbtools
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'UIBuilder' object has no attribute 'on_displayed'

I have tested and can reproduce this bug. It appears to be a compatibility issue with ipywdgets 8.x, a dependency of nbtools, which removed the on_displayed callback.
We will have a new version of nbtools released in the next couple weeks that is ipywidgets 8 compatible. In the meantime, if you remove ipywidgets 8 and instead install ipywidgets 7.6.6, nbtools should work correctly.
nice