Okay, here's how I got beyond the problem .....
Given the error message I decided that a "file by mail" selection must have been set at the start of the process. I couldn't find where to fix that flag anywhere in going through the first steps of the process so I did this instead.
Click on the FILE menu tab at the top right
Click on "File a Return" and select the "E-File' radio button and select "Continue"
on the next screen go to the program File menu at top left and SAVE
Now, go back to the REVIEW menu tab and Voilà the line 88 error is gone and is replaced by needing to fill in e-filing info
Still a bug in the program since that e-file check should happen later in the process, but at least this workaround seems to do the trick.
