Failed to call hook 'IOnPlayerCommand' on plugin 'RustCore v2.0.4948' (InvalidCa
stException: Specified cast is not valid.)
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[]
 args) [0x000fb] in <c2afd8354b8b4f3ca451cf5a1aa111c3>:0
  2kb/s in, 15kb/s out
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] arg

Fixed in the latest version 0.1.2