System.InvalidCastException was unhandled
  Message="Unable to cast object of type 'System.Xml.XmlWellFormedWriter' to type 'System.Xml.XmlTextWriter'."
  Source="XMLRPC"
  StackTrace:
       at Nwc.XmlRpc.XmlRpcSerializer.Serialize(Object obj)
       at OpenSim.Framework.Servers.BaseHttpServer.HandleXmlRpcRequests(HttpListenerRequest request, HttpListenerResponse response) in C:\Sugilite\OpenSim\Framework\Servers\BaseHttpServer.cs:line 174
       at OpenSim.Framework.Servers.BaseHttpServer.HandleRequest(Object stateinfo) in C:\Sugilite\OpenSim\Framework\Servers\BaseHttpServer.cs:line 109
       at System.Threading._ThreadPoolWaitCallback.WaitCallback_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback(Object state)