upload via wordpress

hi i wanna upload a jpg image with the field under the textfield.
now there is the mistake
[quote]The uploaded file could not be moved to /home/www/web3/html/wordpress/wp-content.
Warning: Cannot modify header information – headers already sent by (output started at /home/www/web3/html/wordpress/wp-admin/admin-functions.php:1879) in /home/www/web3/html/wordpress/wp-includes/functions.php on line 1219
[/quote]
dont know what it is?!
my blog http://mike.v427.ncsrv.de/wordpress
please help. thx

yesterday i updated from 1.2 to 2.1.2 maybe there is a mistake? i have the plugin called CQS