The control number in box d in not used to e-file a tax return nor is required by the IRS. Leave box d blank (empty). If you still get an error then delete the W-2 and re-enter the W-2 manually to clear this error.
it does not allow me to skip it. I am using TurboTax
You do not skip the W-2. If you imported the W-2 and now there is an error you need to delete the W-2 and enter it again manually when using the TurboTax program.
yes, I entered manually and still showing the same error
Put your cursor in box d. Now click the delete button on your keyboard several times to remove any characters in the box and to remove any hidden characters after the box "looks" empty.