ayuda sobre servicio web

a que se debe ester error, me tiene paralizado el trabajo


Server Error in '/Adapys.Net.Venta.WebService' Application.

The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its
dependencies) could have been removed, had its name changed, or is
temporarily unavailable. Please review the following URL and make sure that
it is spelled correctly.

Requested URL: /Adapys.Net.Venta.WebService/Service.asmx


Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET
Version:2.0.50727.42