Related posts

I was wondering whether I can active the “related posts” in jetpack, I saw the following:
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘vaultpress_jetpack_more_info_connected’ not found or invalid function name in public_html/wp-includes/plugin.php on line 470

[Moderator Note: No bumping. If it’s that urgent after waiting just 2 hours, consider hiring someone instead.]