Błąd open_basedir restriction

Witam. Moja strona generuje taki błąd i hosting mi ją zablokował. Jak go naprawić?
Kod błędu:

stderr: PHP Warning:  is_dir() [<a
href='function.is-dir'>function.is-dir</a>]: open_basedir restriction in
effect. File(/) is not within the allowed path(s):
(/home/proartlk/:/tmp:/usr/local/lib/php/:/usr/sbin/:/usr/bin/:/usr/local/bin/:/usr/local/sbin/:/bin/:/sbin/)
in
/home/proartlk/domains/zespolprogres.pl/public_html/wp-includes/functions.php
on line 1497

Linia 1497:

// We need to find the permissions of the parent folder that exists and inherit that.
	$target_parent = dirname( $target );
	while ( '.' != $target_parent && ! is_dir( $target_parent ) ) {
		$target_parent = dirname( $target_parent );
	}