Error message

• Warning: uasort() expects parameter 1 to be array, null given in node_view_multiple() (line 2679 of /var/www/vhosts/africanplan.org/achievements.africanplan.org/modules/node/node.module).
• Warning: Creating default object from empty value in pinboard2_like_box_out() (line 1013 of /var/www/vhosts/africanplan.org/achievements.africanplan.org/sites/all/themes/pinboard2/template.php).