I tried all of the methods listed in this thread as well and none worked. (I have the Deluxe CD/desktop version)
THIS worked: Forget manipulating the form/worksheet. Go back to the interview - toward the end of the step-by-step and select the topic about whether you want to defer the tax on your self-employment income for the period covered by COVID. Answer YES. (I answered no originally - we actually had a loss, so it was academic, and were stuck in the loop repeatedly documented here). Once I answered yes, the error disappeared.
Note: the error REAPPEARED every time I saved the TT file. I had to repeat the step above right before I transmitted the return. The final review said no errors, bingo off it went.
Hope this works for you. You would think TT could provide a fix, or better instructions.
