I build a base and put an Ornate Frame Large and then do a /copy on that base. 
When I then want to put the base back in with /paste, the plugin fails.
Error code in CMD:
Exception while calling NextTick callback (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.CopyPaste.PasteEntity (System.Collections.Generic.Dictionary`2[TKey,TValue] data, Oxide.Plugins.CopyPaste+PasteData pasteData, BaseEntity parent) [0x01018] in <8762560baf5a469dbaee3f8452df6f86>:0
  at Oxide.Plugins.CopyPaste.PasteEntity (System.Collections.Generic.Dictionary`2[TKey,TValue] data, Oxide.Plugins.CopyPaste+PasteData pasteData, BaseEntity parent) [0x020ec] in <8762560baf5a469dbaee3f8452df6f86>:0
  that Oxide.Plugins.CopyPaste.PasteLoop (Oxide.Plugins.CopyPaste+PasteData pasteData) [0x00088] in <8762560baf5a469dbaee3

That'll be fixed in the next release