Failed to call hook 'OnPlayerChat' on plugin 'ColouredChat v2.2.3' (NullReferenceException: Object reference not set to an instance of an object)

Could you provide the full error please?

[Error] Failed to call hook 'OnPlayerChat' on plugin 'ColouredChat v2.2.3' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.ColouredChat.OnPlayerChat (BasePlayer player, System.String message, ConVar.Chat+ChatChannel channel) [0x002a6] in <e9ec8578aea94407aecaecb2d5f93308>:0 
  at Oxide.Plugins.ColouredChat.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00496] in <e9ec8578aea94407aecaecb2d5f93308>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <008b12f41ec4452da1a5497eeb849299>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <ac41dd3599754d448b8c218b34645820>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <ac41dd3599754d448b8c218b34645820>:0 

I have a new version almost ready, just want to add a few more things to it.