Uncaught ReferenceError: columns is not defined load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jquery-u&load[]=i-droppable,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu&ver=4.9.9:83
at Object.initToggles (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jquery-u&load[]=i-droppable,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu&ver=4.9.9:83)
at Object.init (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jquery-u&load[]=i-droppable,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu&ver=4.9.9:83)
at HTMLDocument.<anonymous> (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jquery-u&load[]=i-droppable,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu&ver=4.9.9:83)
at i (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jquery-u&load[]=i-droppable,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu&ver=4.9.9:2)
at Object.fireWith [as resolveWith] (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jquery-u&load[]=i-droppable,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu&ver=4.9.9:2)
at Function.ready (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jquery-u&load[]=i-droppable,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu&ver=4.9.9:2)
at HTMLDocument.K (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jquery-u&load[]=i-droppable,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu&ver=4.9.9:2)
initToggles @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jquery-u&load[]=i-droppable,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu&ver=4.9.9:83
init @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jquery-u&load[]=i-droppable,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu&ver=4.9.9:83
(anonymous) @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jquery-u&load[]=i-droppable,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu&ver=4.9.9:83
i @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jquery-u&load[]=i-droppable,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu&ver=4.9.9:2
fireWith @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jquery-u&load[]=i-droppable,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu&ver=4.9.9:2
ready @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jquery-u&load[]=i-droppable,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu&ver=4.9.9:2
K @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jquery-u&load[]=i-droppable,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu&ver=4.9.9:2
please help me on this, it is happening in production