[Plugin: WP Super Cache] File exist

I can’t configure the plugin. I activated the plugin and when I go to configure I get this error Error: [2] mkdir() [function.mkdir]: File exists (/home/deliciousmanga/public_html/wp-content/plugins/wp-super-cache/wp-cache.php – 1238)

http://wordpress.org/extend/plugins/wp-super-cache/