Web interface/omv-firstaid inaccessible

My OMV box has just started to behave oddly; while still listening to music via plex, I noticed that my samba shares were no longer accessible over the LAN, though the music continued to play. After some disconnecting my laptop from the LAN to try and get the shares back, I tried to reboot the server. Since that point, only shell access has been possible.

Tried running omv-firstaid via the CLI; it didn't load, and I got this error message:

/usr/sbin/omv-firstaid: 517: /usr/sbin/omv-firstaid: cannot create /tmp/omv-setup4232: No space left on device

This is what comes up in my browser when I try and access the server via the web interface.

Error #3008:
exception 'OMVException' with message 'Failed to load configuration (Fatal error 4: Document is empty (line=1, column=1))' in /usr/share/php/openmediavault/config.inc:580
Stack trace:
#0 /usr/share/php/openmediavault/env.inc(22): require_once()
#1 /var/www/openmediavault/index.php(23): require_once('/usr/share/php/...')
#2 {main}

This has got me completely stumped. Any idea what might be going on? Thankfully, I have a recent clone of the system drive, but I have no idea what can be causing this, or how to fix it.

Any ideas appreciated.

Thanks - that is really odd, given than the free space on the system drive last week was over 20GB. It doesn't seem normal for it to fill up that fast - if it had, would that indicate some kind of problem?

Given my lack of expertise in the CLI, is it likely to be easier just to restore a Clonezilla image?

Thank you, hoppel and votdev. In the end I did some poking around but decided that since I had a four day old clone of the system disk, that would be easier to restore. This will get me back to the point where I can then prepare for an upgrade to OMV 3 or 4.

Many thanks for your help.