No in this case it means whichever data file was being a converted that has an (Encrypted) CC number in it, that particular record it errored on, the public key in sy_Company doesn't match the encryption value for the card number in the record. Chances are there are other records with the same problem.
IOW Conversion is decrypting the card number using the public key (and falling short on some records ergo the error) so it can re-encrypt it (with the SPS encryption scheme) and store it in the SPS cloud Vault (even if you don't have SPS). There are different variations of the error you're getting but usually this is what's going on. Either you delete the card numbers or generate a new public key and have system re-encrypt for you.