Login Error

I have below error when i enter my user and password and push login Button :

Warning: main(): open_basedir restriction in effect. File(../wp-config.php) is not within the allowed path(s): (.) in /home/alvanweb/public_html/wp-admin/admin.php on line 2

Warning: main(../wp-config.php): failed to open stream: Operation not permitted in /home/alvanweb/public_html/wp-admin/admin.php on line 2

Fatal error: main(): Failed opening required ‘../wp-config.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/alvanweb/public_html/wp-admin/admin.php on line 2

Can you hep me ?
In old days i haven’t any error in login to admin dashboard.
but today i having It .