Error message

• Warning: Undefined array key 0 in wltbootstrap_preprocess_views_view() (line 582 of sites/worldliteraturetoday.org/themes/wltbootstrap/wltbootstrap.theme).
• Warning: Trying to access array offset on null in wltbootstrap_preprocess_views_view() (line 582 of sites/worldliteraturetoday.org/themes/wltbootstrap/wltbootstrap.theme).