https://www.softaculous.com/board/index.php?tid=17567 https://www.softaculous.com/board/index.php?tid=17567&tpg=1#p52375
Was that server re-installed while it was a slave ?

You can forcefully make that server as stand-alone master server.

You can ssh your slave server and set slave value as 0 and remove Master key and ip values from /usr/local/virtualizor/universal.php file .
This will make the server as stand-alone master server.
Make sure to take a backup of the file before making changes to it.]]> Tue, 16 Mar 2021 15:15:59 GMT https://www.softaculous.com/board/index.php?tid=17567&tpg=1#p52375 https://www.softaculous.com/board/index.php?tid=17567&tpg=1#p52373 (In fact, I have deleted this server, but I cannot add it again)]]> Tue, 16 Mar 2021 12:20:27 GMT https://www.softaculous.com/board/index.php?tid=17567&tpg=1#p52373 https://www.softaculous.com/board/index.php?tid=17567&tpg=0#p52372 I cannot Add a Storage. It prompts an error
Slave servers are not allowed to add any Storage !]]> Tue, 16 Mar 2021 11:55:37 GMT https://www.softaculous.com/board/index.php?tid=17567&tpg=0#p52372