I am an admin on my server and when I do the command: /tp [name] [admin] I receive a message: you can't teleport a player to yourself! 
It worked very well before. My plugin is up to date and working fine for all other commands. 
I uninstalled and reinstalled too. Bug? hack? I don't understand... do you have a solution?

hi, nteleportation.disallowtptome blocks this for anyone curious.

I had enabled god mode to true and the nteleportation.bypassfoundationcheck was active. 
This is why the /tp name admin did not work. I disabled both and it works now.