“File Not Found” error message accessing main page after enabling custom feature on site collection

ISSUE:

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àAfter enabling the feature customer was unable to access the main page of the site and got error message “File Not Found”

àYou are facing the same issue when he browse the site actions–site settings, “Master Pages” & “Web Parts”
àYou are able to browse the top level site collection http://sps03.shorturl.com/ main page without any error message
àYou are also able to browse “Sites & Workspaces” beneath the http://sps03.shorturl.com/sites/yagyashree
àYou are using OOB Master Page. A summary of the solution is detailed below.

 

 Cause

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à Users have tried to enable a custom feature on this site collection

 

Resolution

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à Open the SharePoint site http://sps03.shorturl.com/sites/yagyashree in SharePoint Designer 2007
à Opened the subsite under this site
à Copy the default.master from the subsite
à Renamed the original default.master to default.old
à Paste the copy from subsite
à Right Click on new default.master and choose “Make this as new default.master”
à Save the changes
à Open the site and it should be working fine
àCheck the site actions–site settings and check the “master pages” & “web parts”, they should be coming up fine