So, I have the plugin, it worked. I got one of the 6 rolls I made work.. now that one also does not.
I went into the logs.. and found this:
Any help is appreciated, im basically attempting to create a Random roll that has a chance to spawn animals & items.
I also do not understand why when I do /roll permission xx it then deletes the roll and says I have no permission.
same as when I set authlevel to 0/1 etc.

11:28 [Error] Failed to call hook 'cmdRoll' on plugin 'RollTheDice v1.0.6' (NullReferenceException: Object reference not set to an instance of an object)
  at GlobalItemManager.CreateItem (.ItemGeneratorAsset generator, Int32 stackSize) [0x00000] in <filename unknown>:0
  at Oxide.Plugins.RollTheDice.GiveRoll (.PlayerSession session, System.String rollname) [0x00000] in <filename unknown>:0
  at Oxide.Plugins.RollTheDice.TryGiveRoll (.PlayerSession session, System.String rollname) [0x00000] in <filename unknown>:0
  at Oxide.Plugins.RollTheDice.cmdRoll (.PlayerSession session, System.String command, System.String[] args) [0x00000] in <filename unknown>:0
  at Oxide.Plugins.RollTheDice.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00000] in <filename unknown>:0
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00000] in <filename unknown>:0
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x00000] in <filename unknown>:0
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00000] in <filename unknown>:0