can't update wordpress and plguins

am using wordpress 3.4 version, my problem was every time i have something to update like plugins and even wordpress i can’t update to its latest 3.4.1 version

when i update plugin error messages display

“Downloading update from http://downloads.wordpress.org/plugin/seo-ultimate.7.2.5.zip…

Warning: touch() [function.touch]: Unable to create file /home/vol13/byethost31.com/byethost7.com/b7_7177721/mydomain/wp-content/tmp/seo-ultimate.tmp because No such file or directory in /home/vol13/byethost7.com/b7_7177721/mydomain/htdocs/wp-admin/includes/file.php on line 178

Warning: unlink(/home/vol13/byethost7.com/b7_7177721/mydomain/htdocs/wp-content/tmp/seo-ultimate.tmp) [function.unlink]: No such file or directory in /home/vol13/byethost7.com/b7_7177721/mydomain/htdocs/wp-admin/includes/file.php on line 490

Download failed. Destination directory for file streaming does not exist or is not writable.”

below the error when i update wordpress

“Downloading update from http://wordpress.org/wordpress-3.4.1-partial-0.zip…

Warning: touch() [function.touch]: Unable to create file /home/vol13/byethost7.com/b7_7177721/mydomain/htdocs/wp-content/tmp/wordpress-3.tmp because No such file or directory in /home/vol13/byethost7.com/b31_b7_7177721/mydomain/htdocs/wp-admin/includes/file.php on line 178

Warning: unlink(/home/vol13/byethost7.com/b7_7177721/mydomain/htdocs/wp-content/tmp/wordpress-3.tmp) [function.unlink]: No such file or directory in /home/vol13/byethost7.com/b7_7177721/mydomain/htdocs/wp-admin/includes/file.php on line 490

Download failed.: Destination directory for file streaming does not exist or is not writable.

Installation Failed”