HTTP Error 500.19 - Internal Server Error

The requested page cannot be accessed because the related configuration data for the page is invalid.

Detailed Error Information:

Module   CustomErrorModule
Notification   SendResponse
Handler   ASPClassic
Error Code   0x800700b7
Config Error   Cannot add duplicate collection entry of type 'error' with combined key attributes 'statusCode, subStatusCode' respectively set to '400, -1'
Config File   \\?\D:\Inetpub\vhosts\teratron.it\httpdocs\web.config
Requested URL   http://www.teratron.it:80/default.asp?l=1&idA=46&idC=38&cmd=getProd&cmdID=375
Physical Path   D:\Inetpub\vhosts\teratron.it\httpdocs\default.asp
Logon Method   Anonymous
Logon User   Anonymous

Config Source:

    1: <configuration><system.webServer><httpErrors><error statusCode="400" path="C:\Inetpub\vhosts\teratron.it\error_docs\bad_request.html"/><remove statusCode="401" subStatusCode="-1"/><error statusCode="401" path="C:\Inetpub\vhosts\teratron.it\error_docs\unauthorized.html"/><remove statusCode="403" subStatusCode="-1"/><error statusCode="403" path="C:\Inetpub\vhosts\teratron.it\error_docs\forbidden.html"/><remove statusCode="404" subStatusCode="-1"/><error statusCode="404" path="C:\Inetpub\vhosts\teratron.it\error_docs\not_found.html"/><remove statusCode="405" subStatusCode="-1"/><error statusCode="405" path="C:\Inetpub\vhosts\teratron.it\error_docs\method_not_allowed.html"/><remove statusCode="406" subStatusCode="-1"/><error statusCode="406" path="C:\Inetpub\vhosts\teratron.it\error_docs\not_acceptable.html"/><error statusCode="407" path="C:\Inetpub\vhosts\teratron.it\error_docs\proxy_authentication_required.html"/><remove statusCode="412" subStatusCode="-1"/><error statusCode="412" path="C:\Inetpub\vhosts\teratron.it\error_docs\precondition_failed.html"/><error statusCode="414" path="C:\Inetpub\vhosts\teratron.it\error_docs\request-uri_too_long.html"/><error statusCode="415" path="C:\Inetpub\vhosts\teratron.it\error_docs\unsupported_media_type.html"/><remove statusCode="500" subStatusCode="-1"/><error statusCode="500" path="C:\Inetpub\vhosts\teratron.it\error_docs\internal_server_error.html"/><remove statusCode="501" subStatusCode="-1"/><error statusCode="501" path="C:\Inetpub\vhosts\teratron.it\error_docs\not_implemented.html"/><remove statusCode="502" subStatusCode="-1"/><error statusCode="502" path="C:\Inetpub\vhosts\teratron.it\error_docs\bad_gateway.html"/><error statusCode="503" path="C:\Inetpub\vhosts\teratron.it\error_docs\maintenance.html"/></httpErrors></system.webServer></configuration>

More Information:

This error occurs when there is a problem reading the configuration file for the Web server or Web application. In some cases, the event logs may contain more information about what caused this error.

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