When i edit pages ? Error ???

Warning: is_writable() [function.is-writable]: open_basedir restriction in effect. File(/) is not within the allowed path(s): (/home:/tmp:/usr) in /home/idaksh/public_html/wp-admin/includes/misc.php on line 128

Warning: Cannot modify header information – headers already sent by (output started at /home/idaksh/public_html/wp-admin/includes/misc.php:128) in /home/idaksh/public_html/wp-includes/pluggable.php on line 865