[22:02:31] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.util.ReportedException: Exception ticking world
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:704) ~[MinecraftServer.class:?]
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387) ~[ld.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613) ~[MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_101]
Caused by: java.lang.IllegalArgumentException: Don't know how to add class com.pixelmonmod.pixelmon.entities.npcs.NPCShopkeeper!
	at net.minecraft.entity.EntityTrackerEntry.func_151260_c(EntityTrackerEntry.java:632) ~[lw.class:?]
	at net.minecraft.entity.EntityTrackerEntry.func_73117_b(EntityTrackerEntry.java:371) ~[lw.class:?]
	at net.minecraft.entity.EntityTracker.func_85172_a(EntityTracker.java:382) ~[lp.class:?]
	at net.minecraft.server.management.PlayerChunkMapEntry.func_187272_b(PlayerChunkMapEntry.java:161) ~[lx.class:?]
	at net.minecraft.server.management.PlayerChunkMap.func_72693_b(SourceFile:165) ~[ly.class:?]
	at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:222) ~[ls.class:?]
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:698) ~[MinecraftServer.class:?]
	... 4 more
[22:02:31] [Server thread/ERROR]: This crash report has been saved to: /home/root/multicraft/servers/server1/./crash-reports/crash-2016-09-18_22.02.31-server.txt