Error example:
Cannot delete the app. The field has been referred from a Lookup field "「***" in an app "***". Change the "XXXX" field setting or delete the field itself in "XXXX".

Cause:
The app you are trying to delete is referenced by a "Lookup" or "Related records" field in another app which you do not have the permission to manage.

Solutions:

• Contact the user who has the permission to manage the app displayed in the error message, and ask the user to delete the "Lookup" field or the "Related records" field.
  Deleting Fields

• Contact the user who has the permissions to manage the app to be deleted and the app displayed in the error message, and ask the user to carry out the operation to delete the app.