You need to delete the worksheet.

To delete the worksheet in TurboTax Online Premier, do the following:

1. Log in to your return.
2. Click on My Account at the top of the screen.
3. Click on Tools.
4. In the Tools Center, click on Delete a Form.
5. In the list of forms, find the Car and Truck Expenses Worksheet and click delete.

This should clear the error message.