This error always appear when i use sil in game. I always have to reload the plugin for it to work.

Failed to call hook 'SilCommand' on plugin 'SignArtist v1.1.8' (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.SignArtist.SilCommand (Oxide.Core.Libraries.Covalence.IPlayer iplayer, System.String command, System.String[] args) [0x0016c] in :0
at Oxide.Plugins.SignArtist.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0014d] in :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

23:55 [Error] Failed to call hook 'SilCommand' on plugin 'SignArtist v1.1.9' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.SignArtist.SilCommand (Oxide.Core.Libraries.Covalence.IPlayer iplayer, System.String command, System.String[] args) [0x0016c] in <887f70f9991145978d783bc5b5d91dc6>:0
  at Oxide.Plugins.SignArtist.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0014d] in <887f70f9991145978d783bc5b5d91dc6>:0
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <d09a1f46ca2f4432811bcfe45ad13c7b>:0
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <cf88a28c7fb44d36890d85a78331cc9d>:0
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <cf88a28c7fb44d36890d85a78331cc9d>:0

Hey man can you tell me what you did to get this ? 

When the server restarts it put's up that error.

Ok thanks I'll check it out.