my 1b date is xx/yy/2017
My 1c date is xx/yy/2019
Bob 1c should be the date of sale or exchange. That can only be a date in 2019 as that is year of the return. Any earlier date will indeed return an error. Check to make sure you have selected the box below as a long term transaction.
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The date is indeed in 2019 but it is saying that is has to be before 01/01/2019 for the sale.
It is also set as long term
Edit: manually typing in the numbers for the sale instead of copy paste worked.