Invalid image

hi,
i have a problem in page flip plugin.when i oploaded images some images were uploaded fine but some are not showing and show me this message.

Warning: unlink(/home/site/public_html/wp-content/pageflip/images/t_i_7UGPgKpq9l0N.jpg) [function.unlink]: No such file or directory on line 1373 in file /home/site/public_html/wp-content/plugins/page-flip-image-gallery/pageFlip.class.php

TitleInside.jpg – Error [002]: Write file error! Please setup permission to the books/ , images/ , sounds/ folders and include files to “777”

i have also assign permission to book , images and sound folder but the problem still.can anyone please help me.

thanks in advance.

http://wordpress.org/extend/plugins/page-flip-image-gallery/