Solved Error when installing Oxide on staging branch (unsupported)

I have around 8 plugins on my server, it's been working fine until just recently. I use the beta staging option and I've not had any troubles until yesterday, when I run I've been getting this error message. I've verified the files, before I install oxide the server comes up fine but after I install, it loads a few of the plugins and then spews this text out over and over in red.

MissingMethodException: Method not found: 'ListHashSet<InvokeAction>.get_Values'.
NullReferenceException: Object reference not set to an instance of an object

I've uninstalled plugins to see if one of them were causing this issue but to no avail, nothing is working. Normally I don't give up like this but I've hit a wall and hopefully someone here has an answer.

~Thanks
GB

 

Is there a link to the self patcher, and is it easy at all? I have some rudimentary understanding of java and c, but I'm not sure what kind of task I'll be undertaking.

 

Instead of that I took your answer and uninstalled the rust server and installed the normal build, but the error still persists. If you need any files I can provide but I'm at a loss currently, I really wanted to have the server up to practice with friends.

~Thanks
GB

 

Just to let you know, I did get it working thanks. I did use validate every time but it wasn't working, so I just deleted the steamapps and did a full reinstall and it worked. I'm somewhat sad I can't get it working on staging again but this will have to do for the time being.

~Thanks
GB