I had this error and fixed it - here's what happened to me. I started with TT Deluxe and started on my personal return. I later upgraded to TT Home and Business to help a family member file for their home-based business. When I went back to finish my return, I received the same error you described. I looked in "View" from the top toolbar - then looked at Forms. I saw a Schedule C that I knew didn't belong. I went back to the step-by-step and noticed that there was a new tab for "Business" in the top tabs. In there I found the Schedule C that was somehow added to my return. To correct, I opened that tab, and the first section had a blank Schedule C, I just had to delete it. To be safe, I "updated" all of the fields in that tab to be sure they were empty - and it worked, and I was able to electronically file. Hope this helps you.
