Remote Entities [Lib] ~ Error #Help

Hello, today I'm in front of a problem... I'd like to do spawn a Villager in a specific location, with a name above his head, and when I interact (left-click) on him an inventory open with my parameters.. So to use the NPC (villager), I've choose to use the Remote Entities librairie so I have followed the differents orders I've link my Plugin with Remote Entities in the plugin.yml like this :

Code:

depend: [RemoteEntities]

My server is running in CraftBukkit version Spigot-1463 - 1.7.9-R0.1-Snapshot ; my plugin is running in 1.7.9.. But I've got errors, this is the code : http://pastebin.com/VKBw7W9N and the error : http://pastebin.com/k5aGTKBc