How to solve? Server Error in '/' Application.

Problem Description:

Server Error in '/' Application.
Runtime Error
Description:an Application error occurred on the server. The current custom error settings-application prevent the details of the application error from being viewed Remo Tely (for security reasons). It could, however, be viewed by browsers running on the local server machine.

Details:to enable the details of this specific error message to being viewable on remote machines, please create a <custo Merrors> tag within a "Web. config" configuration file located in the root directory of the current Web application. This <customErrors> tag should then has its ' mode ' attribute set to "Off".

<!--Web. config Configuration File--

<configuration>
<system.web>
<customerrors mode= "Off"/>
</system.web>
</configuration>

Notes:the Current error page seeing can is replaced by a custom error page by modifying the "defaultredirect" att Ribute of the application ' s <customErrors> configuration tag to point to a custom error page URL.

<!--Web. config Configuration File--

<configuration>
<system.web>
<customerrors mode= "RemoteOnly" defaultredirect= "mycustompage.htm"/>
</system.web>
</configuration>

New site, often encountered this problem, after the search is to modify the configuration file, but the effect is not good, there are sequelae.

Final Solution:

. Check the Iis-web service extension--asp.net v2.0.50727 and active Server pages have no settings allowed
(If no service extension is re-registering the IIS service extension, enter the command as in "Start"-"run", carriage return C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis-i-enable)
2. Control Panel--management tool--services--asp.netstate Service set to Automatic, and start
1 after execution if not, it's best to reestablish a virtual directory or Web site
Recent occurrences should have been caused by the update of. NET Patches

How to solve? Server Error in '/' Application.