[PHYSICS] [11-27 11:00:33] Added physics engine: modified_BulletX
ERROR [ ]: System.InvalidCastException: Cannot cast from source type to destination type.
  at OpenSim.Region.Physics.Manager.PhysicsPluginManager.AddPlugin (System.String FileName) [0x00000] 
  at OpenSim.Region.Physics.Manager.PhysicsPluginManager.LoadPlugins () [0x00000] 
  at OpenSim.Region.ClientStack.RegionApplicationBase.GetPhysicsScene (System.String engine, System.String meshEngine) [0x00000] 
  at OpenSim.OpenSimMain.GetPhysicsScene () [0x00000] 
  at OpenSim.Region.ClientStack.RegionApplicationBase.SetupScene (OpenSim.Framework.RegionInfo regionInfo, OpenSim.Region.ClientStack.UDPServer& udpServer) [0x00000] 
  at OpenSim.OpenSimMain.CreateRegion (OpenSim.Framework.RegionInfo regionInfo) [0x00000] 
  at OpenSim.ApplicationPlugins.LoadRegions.LoadRegionsPlugin.Initialise (OpenSim.OpenSimMain openSim) [0x00000] 
  at OpenSim.OpenSimMain.StartUp () [0x00000] 
  at OpenSim.Application.Main (System.String[] args) [0x00000]