wp4.9.8 后台菜单添加时，出现admin-ajax.php错误

load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,wp-a11y,wp-util,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-&load[]=ui-draggable,jquery-ui-droppable,backbone,wp-backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,wp-codemirror&ver=4.9.8:4 POST http://calonye.com/wp-admin/admin-ajax.php 500 (Internal Server Error)
send @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,wp-a11y,wp-util,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-&load[]=ui-draggable,jquery-ui-droppable,backbone,wp-backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,wp-codemirror&ver=4.9.8:4
ajax @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,wp-a11y,wp-util,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-&load[]=ui-draggable,jquery-ui-droppable,backbone,wp-backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,wp-codemirror&ver=4.9.8:4
(anonymous) @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,wp-a11y,wp-util,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-&load[]=ui-draggable,jquery-ui-droppable,backbone,wp-backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,wp-codemirror&ver=4.9.8:17
a.Deferred @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,wp-a11y,wp-util,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-&load[]=ui-draggable,jquery-ui-droppable,backbone,wp-backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,wp-codemirror&ver=4.9.8:9
send @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,wp-a11y,wp-util,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-&load[]=ui-draggable,jquery-ui-droppable,backbone,wp-backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,wp-codemirror&ver=4.9.8:17
post @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,wp-a11y,wp-util,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-&load[]=ui-draggable,jquery-ui-droppable,backbone,wp-backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,wp-codemirror&ver=4.9.8:17
g @ load-scripts.php?c=0&load[]=heartbeat,customize-base,customize-controls,customize-widgets,accordion,customize-nav-menus,imgareaselect,customize-models,custo&load[]=mize-views,mce-view,image-edit,quicktags,wplink,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,thickbox,media-upload&ver=4.9.8:5
save @ load-scripts.php?c=0&load[]=heartbeat,customize-base,customize-controls,customize-widgets,accordion,customize-nav-menus,imgareaselect,customize-models,custo&load[]=mize-views,mce-view,image-edit,quicktags,wplink,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,thickbox,media-upload&ver=4.9.8:5
(anonymous) @ load-scripts.php?c=0&load[]=heartbeat,customize-base,customize-controls,customize-widgets,accordion,customize-nav-menus,imgareaselect,customize-models,custo&load[]=mize-views,mce-view,image-edit,quicktags,wplink,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,thickbox,media-upload&ver=4.9.8:6
dispatch @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,wp-a11y,wp-util,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-&load[]=ui-draggable,jquery-ui-droppable,backbone,wp-backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,wp-codemirror&ver=4.9.8:3
r.handle @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,wp-a11y,wp-util,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-&load[]=ui-draggable,jquery-ui-droppable,backbone,wp-backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,wp-codemirror&ver=4.9.8:3