I am getting a weird error on an Umbraco site I maintain. I'm trying to delete an old Document Type that I am replacing with an updated one. The error I am getting is:
Error handling action Item has already been added. Key in dictionary: 'textpage' Key being added: 'textpage'
The document type is not called "textpage" and doesn’t have any link to "textpage" that I can see. There are no physical files on the server and this error didn’t happen on the staging site nor did it occur on my local test. So I am a little stumped!
Any suggestions?
EDIT: This is also occurring if I try to save any document type in the CMS.