An error loading the plugin:

Failed to call hook 'OnServerInitialized' on plugin 'MarkerManager v3.0.0' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.MarkerManager.Message (BasePlayer player, System.String messageKey, System.Object[] args) [0x00000] in <c91c93a4501a4bbf939fadc07dae317d>:0

  at Oxide.Plugins.MarkerManager.CreateCustomMarker (Oxide.Plugins.MarkerManager+CachedMarker def, BasePlayer player) [0x0009e] in <c91c93a4501a4bbf939fadc07dae317d>:0

  at Oxide.Plugins.MarkerManager.LoadCustomMarkers () [0x00018] in <c91c93a4501a4bbf939fadc07dae317d>:0

  at Oxide.Plugins.MarkerManager.OnServerInitialized () [0x00010] in <c91c93a4501a4bbf939fadc07dae317d>:0

  at Oxide.Plugins.MarkerManager.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x000b8] in <c91c93a4501a4bbf939fadc07dae317d>:0

  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <60c318df79ed41688ea59335e48d61ad>:0

  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <dfcb48ea05694263bbc08e62a39c274c>:0

  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <dfcb48ea05694263bbc08e62a39c274c>:0

yeah I'm getting this now suddenly as well

Fixed it