After creating virtual server DNS domain was not enabled?

Operating system:
OS version:
Operating system CentOS Linux 7.9.2009
Webmin version 1.973 Usermin version 1.823
Virtualmin version 6.16

hello every one
after creating virtual server
and it is working
I found DNS domain was not enabled
when I try to tick and enable it
it gives me this error

Failed to modify server : The DNS domain is already hosted by your DNS server

whats the solution please?

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