Getting that error plus

| [Oxide] 17:39 [Error] Failed to call hook 'CommandFriend' on plugin 'Friends v3.0.0' (FormatException: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.)
  at System.Text.StringBuilder.AppendFormatHelper (System.IFormatProvider provider, System.String format, System.ParamsArray args) [0x000ff] in <a8ed250850854b439cedc18931a314fe>:0 
  at System.String.FormatHelper (System.IFormatProvider provider, System.String format, System.ParamsArray args) [0x00023] in <a8ed250850854b439cedc18931a314fe>:0 
  at System.String.Format (System.String format, System.Object[] args) [0x00020] in <a8ed250850854b439cedc18931a314fe>:0 
  at Oxide.Plugins.Friends.GetLang (System.String langKey, System.String playerId, System.Object[] args) [0x0000e] in <7370ee4013604ba3a75cf703c94b202d>:0 
  at Oxide.Plugins.Friends.Message (Oxide.Core.Libraries.Covalence.IPlayer player, System.String langKey, System.Object[] args) [0x00014] in <7370ee4013604ba3a75cf703c94b202d>:0 
  at Oxide.Plugins.Friends.CommandFriend (Oxide.Core.Libraries.Covalence.IPlayer player, System.String command, System.String[] args) [0x00084] in <7370ee4013604ba3a75cf703c94b202d>:0 
  at Oxide.Plugins.Friends.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x017d3] in <7370ee4013604ba3a75cf703c94b202d>: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​

You are outdated, please update before reporting issues.

Yup, sorry Wulf! I noticed just after posting. Thanks for getting back to me though :)