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Error "There are some problems with the design of this form ... <control name> is not defined" After Deleting Control

After deleting a control with a button that calls JavaScript, the following error occurs:

An embedded page at says:
There are some problems with the design of this form and this is causing some errors. Please contact the designer of this form to rectify these.

The form is reporting the following errors:
<control name> is not defined

This error persists even after deleting the form and creating a new version with the default SharePoint form.
  1. In SharePoint designer, navigate to the site > All Files > Lists > ListName > Item.
  2. Delete the NFForm.xml file.
  3. Navigate to https://tenanturl/site/NintexFormXml.
  4. Find and delete the file that contains the matching List GUID.
  5. Create a new form in the designer.
Nintex Forms stores two copies of the form and they can conflict with each other. Deleting both copies of the form resets the form completely.
Version history
Revision #:
1 of 1
Last update:
‎11-20-2018 08:35 AM
Updated by: