I'm having the exact same issue 

I too am having the exact same issue. Ive tried everything (including waiting a few days and coming back to it) 

Have you tried clearing cookies 'n cache or using a different browser? Make sure your internet connection is stable. We would also suggest try starting a new return and see if you get the same error.

I was having this same issue - in the Self-Employment section as well.. I called Turbo Tax and they said there is an open case from multiple reports of this  .. BUT .. 

I went back in and rather than *edit* the existing business that was already saved from last year, I deleted that and just added the business again - It only took an extra minute to add the info back in, and I was able to get through and get my taxes filed. 

I had been getting SO annoyed!! Tried starting a new return, clearing cache, all the typical stuff - So was pretty happy when this finally worked!  -- I hope its helpful for you too!

Thank you so much! This worked for me too! 
I was so frustrated, was thinking I was going to have to use a different program as nothing was working. 
Brilliant! Thanks for taking the time to share.