Site upload Server appears: Server error in '/' Application error

The following error occurred after uploading the server to the local Web site: Server error in '/' Application. Runtime Error

<!--Web. config Configuration File--><configuration> <system.web> <customerrors mode= "Off"/> </system.web></configuration>

Notes: The current error page is seeing can is replaced by a custom error page by modifying the "defaultredirect" attribute 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>

Cause: Webconfig duplicate configuration causes errors

WORKAROUND: Delete the extra webconfig file.

Site upload Server appears: Server error in '/' Application error