Fatal Error! Failed to setup temp directory /tmp/.webmin : No such file or directory

SYSTEM INFORMATION
OS type and version Ubuntu 22.04
Webmin version Latest

I created a new domain and it worked without problem. When I logged in next time I got this
Fatal Error!
Failed to setup temp directory /tmp/.webmin : No such file or directory

When I reloaded the browser I got this
Fatal Error!

Failed to open /etc/webmin/miniserv.conf for writing : No such file or directory

All other domains are working normal.
What can be wrong and what can be done

Sounds like you’re running out of disk space, or some parts of your filesystem are otherwise unwritable.

Go to Edit Virtual Server for this domain and check if there is any error/red text about the server quota if the problem is not there try checking Error Logs.

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