Cannot modify header information – headers already sent – error

Hi,

When I add the product from the shop page, the plugin works like charm.
But, when i try to add a product to wishlist from the single product page, I am getting this message.

true##Product added!
Warning: Cannot modify header information – headers already sent by (output started at /home/dreams/public_html/wp-content/plugins/yith-woocommerce-wishlist/yith-wcwl-ajax.php:47) in /home/dreams/public_html/wp-includes/pluggable.php on line 899

Some one please help me with this. My site is under development now, i can’t put my url here.

http://wordpress.org/plugins/yith-woocommerce-wishlist/