I am new at building themes and just discovered DEBUG

I am new at building themes and just discovered DEBUG (Thanks to one of your fine articles) I am using Recent custom posts widget in my wigitised footer and am getting this warning:

Notice: WP_Query was called with an argument that is deprecated since version 3.1! "caller_get_posts" is deprecated. Use "ignore_sticky_posts" instead. in /Applications/MAMP/htdocs/wp_corpak/wp-includes/functions.php on line 3495

I just downloaded this pluging last week. Should this be an issue? Can you please guide me through how to fix this? Thank you.

FYI my live version of this site is corpakms.net