[Error] Failed to call hook 'OnServerInitialized' on plugin 'CustomAutoKits v1.2.3' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.CustomAutoKits.OnServerInitialized () [0x000e5] in <e18c84d1f5d6491cb48f7279afab4f1d>:0 
  at Oxide.Plugins.CustomAutoKits.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0016e] in <e18c84d1f5d6491cb48f7279afab4f1d>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <1e2d7ad0801a4037ab6a24578c814b54>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <1fe782f4b27a43ae85d29ebb2d56c007>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <1fe782f4b27a43ae85d29ebb2d56c007>:0 

This plugin was working just fine until today it seems. I am now getting this error among others while the server is running.

Please send your config

{
  "Empty default items before give kits": true,
  "Auto Kits": [
    {
      "permission": "customautokits.spawn",
      "kits": [
        {
          "priority": 0,
          "cooldown": 0.0,
          "kitName": "spawn",
          "cooldownKit": "Default Kit"
        }
      ]
    }
  ],
  "Chat Settings": {
    "Chat Command": "autokit",
    "Chat Prefix": "[CustomAutoKits]: ",
    "Chat Prefix Color": "#00FFFF",
    "Chat SteamID Icon": 0
  }
}

There seems to be no error. Are you using this Kit plugin?  -> https://umod.org/plugins/rust-kits

I am yes for other things. The data file for this plugin was just "null" so I unloaded the plugin, deleted the data file, and reloaded the plugin. No issues anymore. Just odd to randomly go null on me.