i need create 16.725 thumbnail....     (http://localhost/admin.php?page=thumbnail)

this is the error.....

Notice: getimagesize(): Read error! in /var/www/admin/thumbnail.php on line 355

Notice: getimagesize(): Read error! in /var/www/admin/thumbnail.php on line 355

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see the list of images to create Thumbnails ... but nothing happens. says: write error. or something.