On Yith Wishlist settings page this : Warning: stripslashes() expects parameter 1 to be string, array given in /home/ahmed/public_html/wp-content/plugins/woocommerce/includes/admin/class-wc-admin-settings.php on line 190
I found out the problem. Default wishlist short code was wrong in mysiteurl.com/wish list.
This is what it should have been :[woodmart_wishlist]
But it was [yith_wcwl_wishlist]