During transfer of zone {0} from master at {1}, the DNS server received a CNAME (alias) resource record (RR) for domain node ...

During transfer of zone {0} from master at {1}, the DNS server received a CNAME (alias) resource record (RR) for domain node {2} for which other records of that name were already received.  When used, the CNAME RR must be the only record for its domain name.  The CNAME RR for {2} will be ignored.