iam getting error in LDAP using Asp.net

HTTP Error 500.24 - Internal Server Error
An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode.

Most likely causes:
system.web/identity@impersonate is set to true.

Things you can try:
If the application supports it, disable client impersonation.
If you are certain that it is OK to ignore this error, it can be disabled by setting system.webServer/validation@validateIntegratedModeConfiguration to false.

Detailed Error Information:
Module     ConfigurationValidationModule
Notification       BeginRequest
Handler    StaticFile
Error Code     0x80070032
Requested URL      http://localhost:58449/
Physical Path      c:\users\srikanth\documents\visual studio 2012\Projects\FormsAuth\FormsAuth
Logon Method       Not yet determined
Logon User     Not yet determined
Request Tracing Directory      C:\Users\Srikanth\Documents\IISExpress\TraceLogFiles\FORMSAUTH