Mongodb 错误：无法从对象、格式错误的几何图形中提取地理密钥？

我在 mongodb 2.4.3 中收到以下错误

Can't extract geo keys from object, malformed geometry?

{type: "Polygon",
coordinates: [
    [
        [
            103.8324334524412,
            1.284232321447769
        ],
        [
            103.8342325475588,
            1.284232321447769
        ],
        [
            103.8342325469261,
            1.282433678236006
        ],
        [
            103.8324334530738,
            1.282433678236006
        ]
    ]
]}

有人可以帮助我理解这个问题吗？它看起来像一个有效的 geoJSON 对象。我的索引是类型2dsphere.

我正在运行的两个步骤是：

collection.ensureIndex {'geometry' : "2dsphere"}, (error) =>
  # some error checking
  # and then
  collection.insert features, (error) =>
    # features is an array of geoJSON feature objects
    # {"type" : "Feature"
    #  "geometry" : <the Polygon object above>
      }

插入查询会出现此错误。 我试图插入的完整文档是：

{
    "type":"Feature",
    "geometry": {
        "type":"Polygon",
        "coordinates":[
           [
             [103.83243345244122,1.2842323214477689],
             [103.83423254755876,1.2842323214477689],
             [103.83423254692615,1.2824336782360055],
             [103.83243345307383,1.2824336782360055]
           ]
        ]
      },
    "properties":{"name" : "My location"}
  }

geoJSON 中的多边形对象要求第一个点 ([lon, lat]) 与最后一个点相同。 通过进行此更改：

{type: "Polygon",
coordinates: [
    [
        [
            103.8324334524412,
            1.284232321447769
        ],
        [
            103.8342325475588,
            1.284232321447769
        ],
        [
            103.8342325469261,
            1.282433678236006
        ],
        [
            103.8324334530738,
            1.282433678236006
        ],
        [
            103.8324334524412,
            1.284232321447769
        ]
    ]
]}

插入查询工作正常。