No directory, logging in with HOME=/

Greetings all. Very new to OMV and forgive any obvious ignorance on proper use but I would appreciate some help if possible.

I installed OMV 5.4 on my NAS a few months ago and everything went smooth. It's been working wonderfully until a few days ago when I realized one of my containers in Portainer was no loading properly. To diagnose the problem, I attempted to log into OMV through my web GUI. After entering my login credentials, I would get no response other than the obvious refreshing of the page, then right back to the login prompt.

I logged into my NAS directly and encountered the same issue. However, in this case, I saw a flash of text before it refreshed back to the login. I took a photo of it to read it in full and it shows this:

I've read many posts on using omv-firstaid, however, I'm unable to get to a command prompt to utilize it. I've also attempted to login with ROOT and simply get a login incorrect prompt.

All this considered, I'm able to see the OMV and SMB shares in Windows along with all the associated files. Additionally, I'm able to log into Portainer and view the active containers although only one of them seems to be running despite them all reading as "Running".

Any help would be greatly appreciated.

Ok showing my ignorance naturally.

I've also tried logging in with my Root and the password I created when I first installed. Getting Login incorrect. To be clear, I'm also unable to login with the admin or root login via the web console either. Any suggestions for this situation?

Thank you for helping out.

I was able to follow a guide to reset my root password and I'm now able to log in with the root. When I attempt to log into the OMV web UI with the admin user and password (which I know is correct), I do not get a failed login like I do if I purposefully enter incorrect information. It just refreshes back to login again.

Assuming my filesystem might be full, which I cannot imagine it to be, how would I go about checking that or fixing it?

RESOLVED - Thank you. I used omv-firstaid to use the clean option and that got me back in correctly. Thanks for your advice.