i have a problem while installing mojoportal on my pc. the error details are:

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 0x80070032
Config Error The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration
Config File \\?\C:\Users\satheesh\Desktop\mojoportal-2-3-5-5-mssql-net40-deploymentfiles\wwwroot\web.config
Requested URL http://localhost:80/
Physical Path
Logon Method Not yet determined
Logon User Not yet determined
Config Source
1014: </system.webServer>
1015: <system.web.extensions>
1016: <scripting>