I have had my store up an running for a couple of weeks now, and everything has been fine, but today I suddanly got this message on the top of the page.

Warning: I am able to write to the configuration file: /home/monical/public_html/store/includes/configure.php. This is a potential security risk - please set the right user permissions on this file (read-only, CHMOD 644 or 444 are typical). You may need to use your webhost control panel/file-manager to change the permissions effectively. Contact your webhost for assistance.
I checked the file in question, and it was set to 644. I changed it to 444 to check, but I still got the same message. Now I have put my store on mainenence mode, but can anyone please help me?