During transfer of zone %1 from master at %2, the DNS server received a CNAME (alias) resource record (RR) for domain node ...

During transfer of zone %1 from master at %2, the DNS server received a CNAME (alias) resource record (RR) for domain node %3 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 %3 will be ignored.