I can 't seem to upload pictures on the server with D6.10. The uploaded picture should be converted to a thumb with Image API, but the image doesn't even appear on the server, let stand being converted.

This is the notice I get:

* warning: tempnam() [function.tempnam]: open_basedir restriction in effect. File() is not within the allowed path(s): (.:/var/www/vhosts/mink.local:/tmp:/usr/share/pear) in /var/www/vhosts/mink.local/httpdocs/drupal-nl/includes/file.inc on line 756.
* warning: fopen() [function.fopen]: Filename cannot be empty in /var/www/vhosts/mink.local/httpdocs/drupal-nl/includes/file.inc on line 757.
* Het bestand kon niet aangemaakt worden.
* warning: tempnam() [function.tempnam]: open_basedir restriction in effect. File() is not within the allowed path(s): (.:/var/www/vhosts/mink.local:/tmp:/usr/share/pear) in /var/www/vhosts/mink.local/httpdocs/drupal-nl/includes/file.inc on line 756.
* warning: fopen() [function.fopen]: Filename cannot be empty in /var/www/vhosts/mink.local/httpdocs/drupal-nl/includes/file.inc on line 757.
* Het bestand kon niet aangemaakt worden.

* warning: fopen(sites/default/files/.htaccess) [function.fopen]: failed to open stream: Permission denied in /var/www/vhosts/mink.local/httpdocs/drupal-nl/sites/all/modules/filefield/field_file.inc on line 347.

* warning: move_uploaded_file() [function.move-uploaded-file]: Unable to access /Applications/MAMP/tmp/php/Biover_Ad_Slank.jpg in /var/www/vhosts/mink.local/httpdocs/drupal-nl/includes/file.inc on line 572.
* Fout bij uploaden van bestand. Geuploade bestand kon niet verplaatst worden. (Error with uploading file. Uploaded file could not be moved)

Strangely enough I get this notice (bold) about my .htaccess, eventhough I deleted this file from the files-folder.

I checked my permissions with FireFTP and it says (folder + contents): 0755. But in my Finder (Explorer for Mac) it says "reading and writing" about the rights (it's a local server indeed). When I try to adjust the right with FireFTP, I get

550 CHMOD 0777 files: Operation not permitted
: /httpdocs/drupal-nl/sites/default/0777 files

That's frustrating. Ideas on how to fix this anyone?