Just tried to submit fed and state last night. Got this same error. Was on the phone with TT support for a while last night. My computer needed updates. They thought that might be the issue. I did the updates, but didn't help. Reading stuff on here, I hadn't even thought about trying to only submit fed. I did that this morning, and it went through. I then tried state (Ohio), and got the validation failed error :( Still waiting to see/read how to fix this. I've already paid the $25 required to submit state electronically.
