Error in Control Panel

[Pirate45]

When I go into my control panel, I get loads of these messages (hundreds) in the right hand frame.

Assistance is appreciated.

Warning: is_dir() [function.is-dir]: Stat failed for /home/public_html/classifieds/data/15/thumbs/index.htm (errno=13 - Permission denied) in /home/public_html/classifieds/adm-inc.php on line 682

Warning: is_file() [function.is-file]: Stat failed for /home/public_html/classifieds/data/15/thumbs/index.htm (errno=13 - Permission denied) in /home/public_html/classifieds/adm-inc.php on line 686

Warning: is_dir() [function.is-dir]: Stat failed for /home/public_html/classifieds/data//15/thumbs/P10100121.JPG (errno=13 - Permission denied) in /home/public_html/classifieds/adm-inc.php on line 682

Warning: is_file() [function.is-file]: Stat failed for /home/public_html/classifieds/data/15/thumbs/P10100121.JPG (errno=13 - Permission denied) in /home/public_html/classifieds/adm-inc.php on line 686

Warning: is_dir() [function.is-dir]: Stat failed for /home/public_html/classifieds/data/15/thumbs/P10100261.JPG (errno=13 - Permission denied) in /home/public_html/classifieds/adm-inc.php on line 682

Warning: is_file() [function.is-file]: Stat failed for /home/public_html/classifieds/data/15/thumbs/P10100261.JPG (errno=13 - Permission denied) in /home/public_html/classifieds/adm-inc.php on line 686

[Chuck S]

Is your data directory and permissions at every level set to 777 at every level?