The DNS server encountered a resource record (RR) in the zone file %1 at line %2 for a domain name with an existing CNAME ...

The DNS server encountered a resource record (RR) in the zone file %1 at  line %2 for a domain name with an existing CNAME (alias) RR.  Where used,  CNAME RRs must be the only RR for the domain name they are used to  provide an alias for.  Either this RR, or the CNAME RR it conflicts with,  needs to be deleted from zone file %1, which can be found in the  %SystemRoot%\System32\Dns directory.
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