Failed to call hook 'OnServerInitialized' on plugin 'Clans v0.2.5' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.Clans.InitializeClans () [0x00017] in <0422e9949b1944fc89220d1b06679a67>:0 
  at Oxide.Plugins.Clans.OnServerInitialized () [0x0001f] in <0422e9949b1944fc89220d1b06679a67>:0 
  at Oxide.Plugins.Clans.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00117] in <0422e9949b1944fc89220d1b06679a67>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <60c318df79ed41688ea59335e48d61ad>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <9882f28dc2204b4dba514a9ad18f5042>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <9882f28dc2204b4dba514a9ad18f5042>:0 

How can i fix this problem?