I was getting this error as well. I HAD entered this number manually at the end of entering K-1 info (after noticing it was missing), yet the smart check screen showed that value placed in the 2018 row instead, and the 2019 box was blank (causing the error). I started my business in 2019 so it was easy to see Turbo Tax was putting my numbers under the wrong year when it showed I had 2018 losses! I was "lucky" that I knew my 2018 number was 0. I couldn't delete the 2018 value, but when I again entered the 2019 number in the 2019 box within the smart check screen, the 2018 value disappeared and I didn't get any more errors. Looks like a Turbotax bug, hopefully fixed before due date!
