[harrisos@wf192 bin]$ mono OpenSim.exe -sandbox
OpenSim 0.3, SVN build 

Starting...

ServerConsole.cs - creating new local console
Logs will be saved to current directory in region-console-5ee67989-8830-4aa2-958d-9aec05f3145d.log
Http Listener Port [9000]: 

Remoting Listener Port [8895]: 

Default Home Location X [1000]: 

Default Home Location Y [1000]: 

Creating Asset cache

Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object
  at OpenSim.Region.Caches.AssetCache..ctor (System.String assetServerDLLName, System.String assetServerURL, System.String assetServerKey) [0x00000] 
  at OpenSim.OpenSimMain.Initialize () [0x00000] 
  at OpenSim.Region.ClientStack.RegionApplicationBase.StartUp () [0x00000] 
  at OpenSim.OpenSimMain.StartUp () [0x00000] 
  at OpenSim.Application.Main (System.String[] args) [0x00000] 
[harrisos@wf192 bin]$