Just an update. The form I am having issue with is a User Content Type that I created and set as primary user form for the site. The error seems to now affect both admin and site forms and content. I can still create fields, but not add them to either form. By making this the primary user type for the site, is that causing the issue? Does anyone have any fix suggestions or having a similar problem? Thanks in advance.
This is the only form on my site that I am not able to modify. I have created most of the fields and they are all linked to the Content Type that I can't update due to the error in the subject. Is there a way to unlink the fields and either make available for all content types or link to the new content type I will create to replace the existing one that I am having this issue with. And will I lose the data I have already entered?