Try this article from TaxAct https://www.taxact.com/support/[social security number removed] /irs-reject-codes-employer-id-number...

It is not PTO. Could be any number of typos. I would totally delete the W-2s. Exit the program. Come back in and retype them VERY CAREFULLY. If it still happens, either have the client re confirm with the employer(s) or you are stuck with mailing the return.