DNS Records and Options pages cannot load

SYSTEM INFORMATION
OS type and version Ubuntu 20.04
Webmin version 2.001
Virtualmin version 7.7-3

The DNS Records and Options pages cannot be loaded.

" Error reading response length from fastrpc.cgi :"

The same error occur when I tried to backup the virtual server.

I ran the re-check configuration and everything seem to be ok, but yet, the said pages cannot load.

I have recently ran the “apt-get update” and “apt-get upgrade”. I have had this server for few years and this is the first time I have encountered this issue.

Please help. Thanks

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