初次使用Layui formSelects组件 在多级联动时报错!

[ZzwCoder]

<div class="layui-form-item">
        <label class="layui-form-label">省市区</label>
        <div class="layui-inline">
            <select name="orgArea" xm-select="orgArea" lay-verify="required" xm-select-skin="normal">
                <option value="">请选择单位所在省市区</option>
            </select>
        </div>
    </div>

formSelects.data('orgArea', 'local', {
            arr: [
                {
                    "name": "北京",
                    "value": 1,
                    "children": [
                        {
                            "name": "北京市1", "value": 12, "children": [
                                {"name": "朝阳区1", "value": 13, "children": []},
                                {"name": "朝阳区2", "value": 14, "children": []},
                                {"name": "朝阳区3", "value": 15, "children": []},
                                {"name": "朝阳区4", "value": 16, "children": []},
                            ]
                        },
                        {"name": "北京市2", "value": 17, "children": []},
                        {"name": "北京市3", "value": 18, "children": []},
                        {"name": "北京市4", "value": 19, "children": []},
                    ]
                },
                {
                    "name": "天津",
                    "value": 2,
                    "children": [
                        {"name": "天津市1", "value": 51, "children": []},
                    ]
                },
            ],
            linkage: true,
            linkageWidth: 130
        });

如果 去除 linkage属性 即为环比级联模式 则不报错 但没有级联效果