Permissions set, but still won't install

[jefferis]

Unable to continue: Unable to write the configuration file. CHMOD 755 or 777 the /data, /backups folders & sub-folders and retry.


BUT all directories and sub directories are either 777 or 755.

Warning: chmod() [function.chmod]: Operation not permitted in /usr/www/users/USERNAME/buyme/CMS/admin/install.php on line 44

Warning: copy(/usr/www/users/USERNAME/buyme/CMS/data/users/tmp.tmp) [function.copy]: failed to open stream: Permission denied in /usr/www/users/USERNAME/buyme/CMS/admin/install.php on line 45

Warning: chmod() [function.chmod]: Operation not permitted in /usr/www/users/USERNAME/buyme/CMS/admin/install.php on line 48

Warning: copy(/usr/www/users/USERNAME/buyme/CMS/data/users/tmp.tmp) [function.copy]: failed to open stream: Permission denied in /usr/www/users/USERNAME/buyme/CMS/admin/install.php on line 49

Warning: chmod() [function.chmod]: Operation not permitted in /usr/www/users/USERNAME/buyme/CMS/admin/install.php on line 44