Same problem, Error 2 when trying to file Form 1041. After 4 tries at different times of the day, I read this thread. My 8453-FE had been formatted as PDF by Adobe Acrobat and failed to file every time. Size about 900 KB. After reading this I attached the JPG version of the same file, about 800 KB. TTax Business then formatted it to PDF before sending. Filing was successful.
