Help...! (Add categories)

[Caner]

Warning: mkdir(./../data/thumbnails/4) [function.mkdir]: Permission denied in /home/forumsos/public_html/resimgalerisi/admin/categories.php on line 84

Warning: mkdir(./../data/thumbnails/4) [function.mkdir]: Permission denied in /home/forumsos/public_html/resimgalerisi/admin/categories.php on line 87

Warning: Cannot modify header information - headers already sent by (output started at /home/forumsos/public_html/resimgalerisi/admin/categories.php:84) in /home/forumsos/public_html/resimgalerisi/includes/functions.php on line 114

Add categories

[gustav]

Check permissions (chmod) for the /data folder....
If it's a new installation, make sure you've read the installation instructions and set permissions for all folders as described...