***I GOT IT TO WORK***I had this same error for the last week. I just tried it again today and got the same error. But here is what I did to get it to work. I was trying to file my federal and state (TX) franchise tax form at the same time. I changed two things, I'm not sure which one got it to work. I deleted and re-uploaded the signature form 8453-PE (when you click to efile your taxes it asks you if you want to re-upload it). I also unchecked the box to efile my state return at the same time. Then it accepted my federal efile perfectly. Not sure if that will work for everyone else, but it worked for me.
