echarts地图扩展js报错：Uncaught TypeError: Cann?报错

代码如下：

<head runat="server">
    <title></title>
    <script src="echarts/jquery.min.js" type="text/javascript"></script>
    <script src="echarts/esl.js" type="text/javascript"></script>
    <script src="echarts/echarts-plain-map.js" type="text/javascript"></script>

</head>
<body>
    <div id="main" style="height:800px;border:1px solid #ccc;padding:10px;"></div>
    <script type="text/javascript">
        echarts.util.mapData.params.HK = {
            getGeoJson: function (callback) {
                $.getJSON('getJson/HK_geo.json', callback);
            }
        };
        var myChart = echarts.init(document.getElementById('main'));
        option = {
            title: {
                text: '香港18区人口密度（2011）',
                subtext: '人口密度数据来自Wikipedia',
                sublink: 'http://zh.wikipedia.org/wiki/%E9%A6%99%E6%B8%AF%E8%A1%8C%E6%94%BF%E5%8D%80%E5%8A%83#cite_note-12'
            },
            tooltip: {
                trigger: 'item',
                formatter: '{b}<br/>{c} (p / km2)'
            },
            toolbox: {
                show: true,
                orient: 'vertical',
                x: 'right',
                y: 'center',
                feature: {
                    mark: { show: true },
                    dataView: { show: true, readOnly: false },
                    restore: { show: true },
                    saveAsImage: { show: true }
                }
            },
            dataRange: {
                min: 800,
                max: 50000,
                text: ['High', 'Low'],
                realtime: false,
                calculable: true,
                color: ['orangered', 'yellow', 'lightskyblue']
            },
            series: [
        {
            name: '香港18区人口密度',
            type: 'map',
            mapType: 'HK', // 自定义扩展图表类型
            itemStyle: {
                normal: { label: { show: true} },
                emphasis: { label: { show: true} }
            },
            data: [
                { name: '中西区', value: 20057.34 },
                { name: '湾仔', value: 15477.48 },
                { name: '东区', value: 31686.1 },
                { name: '南区', value: 6992.6 },
                { name: '油尖旺', value: 44045.49 },
                { name: '深水埗', value: 40689.64 },
                { name: '九龙城', value: 37659.78 },
                { name: '黄大仙', value: 45180.97 },
                { name: '观塘', value: 55204.26 },
                { name: '葵青', value: 21900.9 },
                { name: '荃湾', value: 4918.26 },
                { name: '屯门', value: 5881.84 },
                { name: '元朗', value: 4178.01 },
                { name: '北区', value: 2227.92 },
                { name: '大埔', value: 2180.98 },
                { name: '沙田', value: 9172.94 },
                { name: '西贡', value: 3368 },
                { name: '离岛', value: 806.98 }
            ],
            // 自定义名称映射
            nameMap: {
                'Central and Western': '中西区',
                'Eastern': '东区',
                'Islands': '离岛',
                'Kowloon City': '九龙城',
                'Kwai Tsing': '葵青',
                'Kwun Tong': '观塘',
                'North': '北区',
                'Sai Kung': '西贡',
                'Sha Tin': '沙田',
                'Sham Shui Po': '深水埗',
                'Southern': '南区',
                'Tai Po': '大埔',
                'Tsuen Wan': '荃湾',
                'Tuen Mun': '屯门',
                'Wan Chai': '湾仔',
                'Wong Tai Sin': '黄大仙',
                'Yau Tsim Mong': '油尖旺',
                'Yuen Long': '元朗'
            },
            // 文本位置修正
            textFixed: {
                'Yau Tsim Mong': [-10, 0]
            },
            // 文本直接经纬度定位
            geoCoord: {
                'Islands': [113.95, 22.26]
            }
        }
    ]
        };
    myChart.setOption(option);
    </script>
</body>