The error 

Failed to call hook 'CmdChat' on plugin 'BetterChat v5.0.19

gonna when i put /chat (command) Ex: /chat set or /chat add

i has set others tags like Vip+ but today i wanna set Vip+++ and this error appear

Full error:

Failed to call hook 'CmdChat' on plugin 'BetterChat v5.0.19' (InvalidOperationException: Sequence contains no matching element)
  at System.Linq.Enumerable.First[TSource] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] predicate) [0x00011] in <839a3cb835c04d14aeb58d83bb7bc4bd>:0

  at Oxide.Plugins.BetterChat.CmdChat (Oxide.Core.Libraries.Covalence.IPlayer player, System.String cmd, System.String[] args) [0x00142] in <2c7363830cba4f0f98f6c504e24c4266>:0

  at Oxide.Plugins.BetterChat.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00548] in <2c7363830cba4f0f98f6c504e24c4266>:0

  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <9affce1cd15c4ec183941adef8db1722>:0

  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <4452f821def6406d834e4149849fe7ea>:0

  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <4452f821def6406d834e4149849fe7ea>:0

Merged post

I still have this errorn anyone can help me ?