[
  {
    "message": "glyphs: Styles must reference glyphs hosted by Mapbox",
    "line": 3
  },
  {
    "message": "sprite: Styles must reference sprites hosted by Mapbox",
    "line": 4
  },
  {
    "message": "sources[0]: Source url must be a valid Mapbox tileset url",
    "line": 8
  },
  {
    "message": "sources[1]: Source url must be a valid Mapbox tileset url",
    "line": 12
  }
]