HELP!!! Installation problem.

After I put the info about database and pressed "submit", I had the following error:

Warning: fopen(../shared/parameters.include.php) [function.fopen]: failed to open stream: Permission denied in /www/blog/www/htdocs/yacs/control/configure.php on line 973

Warning: Cannot modify header information - headers already sent by (output started at /www/blog/www/htdocs/yacs/control/configure.php:973) in /www/blog/www/htdocs/yacs/control/configure.php on line 1101