For anyone who winds up here with the same error message but who, like me, didn't have any crypto transactions, in my case it was due to 1099-B transactions, in the same scenario where I was finishing a return in TurboTax Desktop that I had started in TurboTax Online. The fix was similar: In the Desktop version I deleted all the 1099-B data from EasyStep (I tried deleting just Form 8949 but that didn't work as it's auto-generated and immediately reappeared) and entered it again. The only other hitch is that unlike TurboTax Online, the Mac Desktop version doesn't let you upload PDF's of the 1099-B's; instead it prints out instructions for mailing them in to the IRS.
