Sending invoice after offer accepted keeps saying state doesn't match buyers state

[mytrunk33]

Hello Everyone 

I would appreciate some advice I accepted an offer & trying to send the invoice The invoice won't send it tells me state doesn't match buyers state Tried a few times no success Thanks 

[reallynicestamps]

Did you look up the zipcode on the USPS site?

https://tools.usps.com/go/ZipLookupAction!input.action

You could also try using the extended zipcode (90210-1234) if the seller didn't give it to you.