Error desconocido

Error:
Ésta es una solicitud de recursos Web no válida. |

Descripción Detallada:
en System.Web.Handlers.AssemblyResourceLoader.System.Web.IHttpHandler.ProcessRequest(HttpContext context) en System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() en System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) en System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)