Hi mmax71, I thought I ran into the same thing on something that was 1 vest/1 sell-to-cover (STC). Mine ended up being user error (my own fault), not sure about yours.
When you enter the details, TurboTax asks you for the transaction date and how many were sold - elsewhere on the page they clarify that the "sold" field should not include sell-to-cover transactions. I had been putting 1 in that field thinking it was for the sell-to-cover, but after putting it to 0 based on the instructions, the error went away. The next page lets you put in the 1 from the STC.
