What causes the 'jupyter error displaying widget model not found'?

The 'jupyter error displaying widget model not found' typically arises when a custom Jupyter widget is not correctly registered or loaded within the Jupyter environment. This often happens if the widget's JavaScript or TypeScript files are missing, the `define()` function is not properly defined, or the widget's registration is not executed within a Jupyter Notebook or Lab session. It can also be caused by version mismatches between dependencies or an incorrect path to the widget's definition file.