Turbo Tax says I have an error, a duplicate, in block 12 of my W-2 how do I correct this?

To edit box 12 of your W-2, follow the instructions below"

1. Launch TurboTax
2. Select Wages and Income
3. Select W-2
4. Select Edit next to the W-2 you want to change On the Your W-2 info so far screen
5. Review your entries in box 12 so you can delete the duplicate entry.

If that doesn't work, you can delete the W-2 and re-enter it. Select the trash can icon to delete.

For additional information, refer to the TurboTax Help article How do I change my W-2 info in TurboTax?