JSON ParserError：意外令牌

Question

我试图像这样在Image Magick中读取图像：

img_1 = MiniMagick::Image.open("test_doc_1.jpg")
img_1.data

这是JSON数据的最后一部分：

    "8bim": {
        "length": 40
      },
      "exif": {
        "length": 114
      },
      "icc": {
        "length": 560
      },
      "iptc": {
        "length": 0
      }
    },
    "tainted": false,
    "filesize": "49654B",
    "numberPixels": "2103750",
    "pixelsPerSecond": "42.075MB",
    "userTime": "0.050u",
    "elapsedTime": "0:01.049",
    "version": "/usr/local/Cellar/imagemagick/7.0.8-12/share/doc/ImageMagick-7//index.html"
  }
}

我收到这样的错误：

]JSON::ParserError: unexpected token at ''
from json/ext/Parser.java:236:in `parse'

此错误是什么意思，我该如何解决？