Why do I get an error code on my 1099-R entry for a box 15 State when my 1099-R does not have a box 15b?

Do you have an amount in box 14? If not, leave boxes 14,15 and 16 empty. Otherwise, Box 15 refers to the State that received the state tax withholding (usually your state of residence). Enter your state's two-letter postal abbreviation.