NPC's invisible

I'm having issues with NPC's not spawning in. It shows that they are on the map but when you go to their location, it's just a couple of items floating in the air. They are also able to shoot and kill you but player is unable to kill the NPC. The problem did not start until I put the new add on plugin on the server. Just thought you should be aware of this issue.  

Can i see your configs? any errors in console?

I'll be honest and say I don't know how to show you configuration, but I'll go figure it out. I didn't change anything in the configuration (left default the same). I didn't look in console either. I'll go check it and get you more info very soon. I just thought you should be aware of the issue, in case someone else had it also.

i recommend updating the plugin at the moment