My drop packer will not unpack I get this error

Code:
Loading drop tables...
Loaded 2660 drop tables!
Unpacking...
Exception in thread "main" java.lang.IllegalAccessError: tried to access field c
om.rs.game.npc.Drop.rare from class com.rs.tools.NPCDropPacker
        at com.rs.tools.NPCDropPacker.unpack(NPCDropPacker.java:108)
        at com.rs.tools.NPCDropPacker.main(NPCDropPacker.java:71)
Press any key to continue . . .
1st question complete and fixed!

Also, my players for some reason walk to a corner randomly for no reason at all, there is no force command or anything.

Help for either 2 will be grateful