Plugin stopped working on Tuesday

Here's what I have tried to self-repair:  Deleted the NTeleportation.cs file while server was offline and reinstalled from fresh download version 1.6.6.   Commands are no longer working since Tuesday.   Verified validity of my data and config files with json linter.  Issue persists.  Cannot get commands to work no matter what changes I make.   Let me know if you need further info to troubleshoot my issue. 

Did you verify that the plugin is actually loaded? Usually when commands for a plugin do not work, it's often that the plugin isn't loaded.

OK.... hadn't thought of that.   Will definitely check that.  Why would it not load upon server restart?

If a plugin fails to compile for some reason, it wouldn't load.

(20:16:43) | NTeleportation was compiled successfully in 2277ms

(20:16:43) | Unloaded plugin NTeleportation v1.6.6 by nivex

(20:16:44) | Calling 'OnServerInitialized' on 'NTeleportation v1.6.6' took 494ms

(20:16:44) | Loaded plugin NTeleportation v1.6.6 by nivex

What do you see when you use the commands exactly?

Been on updated 1.6.7 for the last 5 days . update to latest version and see how it goes