Emulator Help Please Review :)(HELP)

[iJavaSucks]

System.NullReferenceException: Object reference not set to an instance of an object.
at Holo.Managers.rankManager.fuseRights(Byte rankID, Int32 userID) in C:\Users\Jamie\Desktop\obbo\Source\Managers\rankManager.cs:line 91
at Holo.Virtual.Users.virtualUser.processPacket(String currentPacket) in C:\Users\Jamie\Desktop\obbo\Source\Virtual\Users\virtualUser.cs:line 416
at Holo.Virtual.Users.virtualUser.dataArrival(IAsyncResult iAr) in C:\Users\Jamie\Desktop\obbo\Source\Virtual\Users\virtualUser.cs:line 291


as my dc.err file anyone help?