ERROR:"An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. "
Do you get this error in your sharepoint site ?
Just one bad day you come in to see that your main page is bombing due to this error with no proper clue .Well it happened to me and i had no idea what went wrong.After lot of research i found something.
I had "?" marks all over my web.config file , which even erased some of characters.
Search for "?" in web.config and start fixing the character in the file. I would suggest replace the web.config (obviously retain the custom entry ) with working one , i replaced my web .config with a working one and Volla!!! it worked for me .
In short the culprit is web.config and not SharePoint installation.
If this helps do leave comments , i would like to know how many SharePointeers got into this issue. :-)