I have an OOTB site and document library. I added the document set content type to the library without any errors. I created a new document set, added the attributes and clicked OK. It went directly to a 404 page.
I went back to the document library home page, refreshed and the new document set record was displayed. I was able to view and edit properties.
1) If I navigate to:
I get the 404 error
2) If I navigate to:
I get a System.NullReferenceException error which makes sense since I removed the id attribute
How do I debug a 404 error for a Document Set's Welcome Page?