Self-select PIN from last year does not match IRS records.

message after being rejected "Self-select PIN from last year does not match IRS records."
I mailed 3029 returns which I am sure the IRS has not even looked at. Is THS the reason i can't e-file? Also, I don't remember having a self select pin for last year because I mailed it. Is this correct? Because my  AGI  is correct. I checked like 10 times.