Ciao, a tutti, non riesco a capire come mai ogni tanto dal mio web site mi arrivano questi errori.

Non riesco a capire:
1.Quale pagina mi genera l'errore
2.Perchè lo genera

codice:
Error Message: This is an invalid script resource request.
Stack Trace:
System.Web.HttpException: This is an invalid script resource request. at System.Web.Handlers.ScriptResourceHandler.Throw404() at System.Web.Handlers.ScriptResourceHandler.DecryptParameter(NameValueCollection queryString) at System.Web.Handlers.ScriptResourceHandler.ProcessRequest(HttpContext context) at System.Web.Handlers.ScriptResourceHandler.System.Web.IHttpHandler.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
________________________________________
Browser Capabilities
Type = IE7
Name = IE
Version = 7.0
Major Version = 7
Minor Version = 0
Platform = WinNT
Is Beta = False
Is Crawler = False
Is AOL = False
Is Win16 = False
Is Win32 = True
Supports Frames = True
Supports Tables = True
Supports Cookies = True
Supports VBScript = True
Supports JavaScript = 1.2
Supports Java Applets = True
Supports ActiveX Controls = True
Supports JavaScript Version =


Nel mio web config
ho inserito
codice:
<machineKey validationKey="5B4F4E3BE19C1B7F1DEE6A27E07A8733532983B3AF2F28E62021894BE02C4A56EE33E8FA74077B18F1F09DA6861F1910920CDAEC3798B9C66A35BD3BCA63EA29" decryptionKey="8BFFCD5AC224074835D2227D1951D5700BBA2044B173E3DD574B75D2F66392EB" validation="SHA1" decryption="AES" />
però non è cambiato nulla.
Chi mi può aiutare?