Oxide - Server won't load save

So I decided to reinstall my server, I backed up all my oxide plugins/config and data files as well as my server folder. After the reinstall I started the server and let it come up, I then shut if back down and loaded my server folder onto the server as well as the plugins/config and data files. I started the server again and then this is what I get
Code:
Error loading save (server/fragnet/proceduralmap.4000.421.156.sav): An exception was thrown by the type initializer for FileStorageNullReferenceException: Object reference not set to an instance of an object
  at BuildingBlock.GetGrade (Enum iGrade) [0x00000] in <filename unknown>:0
  at BuildingBlock.get_currentGrade () [0x00000] in <filename unknown>:0
  at BuildingBlock.ChangeSkin () [0x00000] in <filename unknown>:0
  at BuildingBlock.UpdateSkin (Boolean force) [0x00000] in <filename unknown>:0
  at SaveRestore.InitializeEntityConditionals () [0x00000] in <filename unknown>:0
  at Bootstrap+<StartServer>c__Iterator2.MoveNext () [0x00000] in <filename unknown>:0
  at UnityEngine.SetupCoroutine.InvokeMoveNext (IEnumerator enumerator, IntPtr returnValueAddress) [0x00000] in <filename unknown>:0
 
(Filename:  Line: -1)

Server won't load save

Manvaril