Hive.CompactHive() Object reference not set to an instance of an object.

[Nick]

Type #0: System.NullReferenceException
Message #0: Object reference not set to an instance of an object.
Source #0: Little Registry Optimizer
Target Site #0: Void CompactHive()
Stack Trace:
  at Little_Registry_Optimizer.Hive.CompactHive()
  at Little_Registry_Optimizer.Main.CompactHives()
  at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
  at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
  at System.Threading.ThreadHelper.ThreadStart()