I received a similar error message and after hours of frustration, I found the problem was that a required e-file attachment was too large. TT generated the 1 page attachment and I used the "Print to PDF" option. The resulting file was a huge 27MB! I ended up printing the form, scanning it and attaching the new file which was <1MB. The e-file went through immediately.
There is a bug in how TT generated this PDF attachment using the "Print to PDF" option. Regardless, a simple error message "Attachment too large" would have avoided several hours of frustration. Tech support was of no help.
