HTTP Error 500.19 - Internal Server Error (Its not duplicate)

I'm running web application in Asp.net 4.5, Application was made in version 3.5. It is showing these errors in every page when i brows in window.

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

Detailed Error Information:

** Module IIS Web Core Notification Unknown Handler Not yet determined Error Code 0x800700b7 Config Error Config section 'system.webServer/modules' already defined. Sections must only appear once per config file. See the help topic for exceptions Config File \?\C:\Users\AbdulSamad\Desktop\Sky1Ex\Sky1Ex\web.config Physical Path
Logon Method Not yet determined Logon User Not yet determined Request Tracing Directory C:\Users\AbdulSamad\Documents\IISExpress\TraceLogFiles\

Config Source:

 129:     <modules runAllManagedModulesForAllRequests="true" />
  130:     <modules>  //error
  131:       <remove name="ScriptModule" />

Showing error in line 130