Traceback most recent call last File CUserswuhejAppDataLocalProgramsPythonPython38libsite-packagestraitletstraitletspy line 656 in get value = obj_trait_valuesselfname KeyError layout

This error is most likely caused by a missing or misspelled attribute name 'layout' in the code. It could also be caused by an issue with the installation of the traitlets module. To fix the issue, check the code for any missing or misspelled attribute names and make sure that the traitlets module is properly installed.