An error in a TALES override may prevent you from viewing the form, but it shouldn't stop you from editing it.

To edit, navigate to the form (you'll see your error).

• If the error is in a form override, add "/atct_edit" to the end of the URL to reach the editor. That will allow you to reach the form editor; now go to the overrides fieldset and fix the problem.
• If the error is in a field override, add "/folder_contents" to the end of the URL to reach the folder contents. Click on the troubled field; you'll again get an error. Now, add "/atct_edit" to the end of the URL to reach the editor.