HTTP Error 500.19 - Internal Server Error The requested page cannot be accessed because the related configuration data for the page is invalid.

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ASP.NET

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 IIS Web Core
Notification BeginRequest
Handler Not yet determined
Error Code 0x800700b7
Config Error Config section 'system.webServer/validation' already defined. Sections must only appear once per config file. See the help topic <location> for exceptions
Config File \\?\D:\web11\web.config
Requested URL http://localhost:8088/web11/
Physical Path D:\web11\
Logon Method Not yet determined
Logon User Not yet determined



Config Source
68: modules runAllManagedModulesForAllRequests="true"/>
69: validation validateIntegratedModeConfiguration="false"/>
70: handlers>