I am using the online edition to do my 2021 taxes.

The error is "Oops we encountered an error. What happened to my data? Don't worry! With the exception of the last page you were on, all the data you have entered so far has been safely saved on our secure server. What do I do now?Try going back to the start of the interview and navigating past the step where you encountered the error.You can also go to the Return Manager and select a new return to work on."

This error page occurs when I proceed after the page "Did you make a Year-End adjustment"  (Were you required to make an adjustment using a T1139 form?)  in the self employment business section. 

I can not go back. I have to return to the menu. 

Thanks.