Warning: Missing argument 2 for add_help_link()

This error appeared in three sites my suddenly. What can I do to solve?

IMAGE: http://i.imgur.com/RaENOY2.png

Error: Warning: Missing argument 2 for add_help_link() in /home/reblogac/public_html/wp-content/plugins/redirect-url-to-post/redirect-url-to-post.php on line 225

https://ww.wp.xz.cn/plugins/redirect-url-to-post/