Error on updating

CustomButtons was compiled successfully in 2195ms
Failed to call hook 'OnServerInitialized' on plugin 'CustomButtons v2.0.5' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.CustomButtons.OnServerInitialized () [0x00023] in <9ee7412cefe64c728920876e0358d431>:0 
  at Oxide.Plugins.CustomButtons.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00fc1] in <9ee7412cefe64c728920876e0358d431>: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

i get this when i attempt to update the plugin

You have to delete old config file.

Changed Status from Pending to Not a Bug