548809 wordpress errors after changing host provider

Hi all, I have a wordpress blog which was running on a server. I have copied everything over inclusivly the sql data. Create new database and all imported again. Everything works again. But when I try to upload stuff I get errors. Also the media liberary gives errors. I know it is Path related. Because Wordpress displays the wrong path. For example: Warning: is_dir() [function.is-dir]: open_basedir restriction in effect. File(/) is not within the allowed path(s): (/home/admin/:/tmp:/var/tmp:/usr/local/lib/php/) in /home/admin/domains/mydomain/public_html/wp-includes/[login to view URL] on line 2104 I know this is the wrong path it should be without the /home/admin/domains/mydomain But I don't know where to remove this information. Anyone who can help?