When I try to use it through in-game chat as admin, it shows these error in server console:

[ServerArmour] Error (Index was outside the bounds of the array.)
   at void Oxide.Plugins.ServerArmour.SCmdClanBan(IPlayer player, string command, string[] args) in D:/TCAFiles/Users/xxxxxxx/7XXXXX6/carbon/plugins/ServerArmour.cs:line 1072
   at object System.Reflection.RuntimeMethodInfo.Invoke(object obj, BindingFlags invokeAttr, Binder binder, object[] parameters, CultureInfo culture)​

I had to use the normal ban command "/sa.ban" and ban each player from the same team manually.