未定义不是Fullcalendar js上的函数

需要有关fullcalendar.js的帮助。在Web检查器上看到时，我发现错误“未定义不是函数”。但是我认为代码很好。您可以查看此小提琴https://jsfiddle.net/3kq85hx0/以获得详细信息。

$(document).ready(function() {

    var date = new Date();
    var d = date.getDate();
    var m = date.getMonth();
    var y = date.getFullYear();

    var calendar = $('#calendar').fullCalendar({
        header: {
            left: 'prev,next today',
            center: 'title',
            right: 'resourceDay,resourceWeek,resourceNextWeeks,resourceMonth'
        },
        defaultView: 'resourceWeek',
        firstDay: 1,    
        editable: true,
        selectable: true,
        minTime: 8,
        snapMinutes:10,
        weekNumbers: false,
        weekNumberTitle: 'Viikko ',
        refetchResources: true,
        maxTime:16,
        selectHelper: true,
        resources: 'json-resources.php',
        events: [       
            {
                title: 'Meeting from this day to this +4',
                start: new Date(y, m, d, 10, 30),
                end: new Date(y, m, d+4, 11, 00),
                resource: 'resource1'
            },  
            {
                title: 'Meeting last week',
                start: new Date(y, m, d-7, 10, 30),
                end: new Date(y, m, d-7, 12, 15),
                resource: 'resource1'
            },  
            {
                title: 'meeting tomorrow',
                start: new Date(y, m, d+1, 10, 30),
                end: new Date(y, m, d+1, 12, 00),
                resource: 'resource1'
            }   
        ],
        select: function(start, end, allDay, jsEvent, view, resource) {
            var title = prompt('event title:');

            if (title) {
                calendar.fullCalendar('renderEvent',
                    {
                        title: title,
                        start: start,
                        end: end,
                        allDay: allDay,
                        resource: resource.id
                    },
                    true // make the event "stick"
                );
            }
            calendar.fullCalendar('unselect');
        },
        resourceRender: function(resource, element, view) {
            // this is triggered when the resource is rendered, just like eventRender
        },
        eventDrop: function( event, dayDelta, minuteDelta, allDay, revertFunc, jsEvent, ui, view ) { 
            alert('event moved to '+event.start+' to '+event.resource);
        },
        eventResize: function( event, dayDelta, minuteDelta, revertFunc, jsEvent, ui, view ) { 
            alert('event was resized, new endtime: '+event.end);
        },
        eventClick: function ( event, jsEvent, view )  {
            alert('event '+event.title+' was left clicked');
        }
    });
});

谢谢。