Strange Error, no Solution !!

[Plab]

Here is my Errorinformation.

Message: Exception of type System.Web.HttpException was thrown.

Source: System.Web

StackTrace:
at System.Web.HttpApplication.MapHttpHandler(HttpContext context,
String requestType, String path, String pathTranslated, Boolean
useAppConfig)
at System.Web.MapHandlerExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,
Boolean& completedSynchronously)

TargetSite: System.Web.IHttpHandler
MapHttpHandler(System.Web.HttpContext, System.String, System.String,
System.String, Boolean)


Have everyware any input or solution of this kind of error ?
I have search the groups, but nothing found with same problem.

thanks
Pat