I have been using copy paste for a long time. Just recently I came across this error in my console. 

Failed to call hook 'TryPasteFromVector3' on plugin 'CopyPaste v4.1.27' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Core.Configuration.DynamicConfigFile.get_Item (System.String key) [0x00000] in :0

  at Oxide.Plugins.CopyPaste.TryPaste (UnityEngine.Vector3 startPos, System.String filename, BasePlayer player, System.Single rotationCorrection, System.String[] args, System.Boolean autoHeight, System.Action callback) [0x00056] in <11225d7d0d5b47a78a399d3296322a5a>:0

  at Oxide.Plugins.CopyPaste.TryPasteFromVector3 (UnityEngine.Vector3 pos, System.Single rotationCorrection, System.String filename, System.String[] args, System.Action callback) [0x00000] in <11225d7d0d5b47a78a399d3296322a5a>:0

  at Oxide.Plugins.CopyPaste.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0045d] in <11225d7d0d5b47a78a399d3296322a5a>:0

  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <80b90e8213db44b29ec2d4111764172c>:0

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

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

I made sure to download the latest version of CopyPaste as well.
Hope someone could be of assistance, thank you!

-Marine