could not upload image in media library

I am trying upload an image in media library, on browsing the images its shows that the image is uploading, but after that image could not be uploaded and it shows this error–

top-long-bg.jpg Missing a temporary folder.

open file wp_config.php and add code

define('WP_TEMP_DIR', dirname(__FILE__) . '/wp-content/temp/');

via ftp in the folder /wp-content, create a new catalog /temp/