This error occurs when a user specified in a filter on Kintone’s view settings is deleted, followed by an attempt to execute customizations related to that view. For instance, attempting to “Put Keyword Search Form on List Page” in this state will lead to this error.
Deleting a user in Kintone does not trigger an error, making it easy to overlook the situation. However, this can lead to issues that require careful attention.
Please ensure that you either delete or update all views that use the deleted users as filtering criteria in the Kintone settings.