Error, and permission doesn't exist.

After plugin loads I get this. And there is no permission, it doesn't exist. I'm using a custom map, IDK if that matters...?

04:32 [Info] Unloaded plugin QuarryLevels v1.0.5 by Death
04:32 [Error] Failed to call hook 'OnServerInitialized' on plugin 'QuarryLevels v1.0.5' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.QuarryLevels.OnServerInitialized () [0x000a5] in <742c1c9393a04f579b59ab9a4eb20778>:0 
  at Oxide.Plugins.QuarryLevels.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0006a] in <742c1c9393a04f579b59ab9a4eb20778>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <31122a27a2414cd799150f8677cf39d4>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <0fbce81d88d64454b3e7abb24df7026b>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <0fbce81d88d64454b3e7abb24df7026b>:0 
04:32 [Info] Loaded plugin QuarryLevels v1.0.5 by Death