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Try deleting the w-2, closing the program then reopen and re import.  if the same issue occurs, there's probably an issue with the import file created by your payroll service provider/employer, For box 14 there is always some letters along with an amount. If the error recurs contact your employer to make sure there should be nothing in box 14, if that's the case just edit your w-2 to remove what's in that box