Mirador viewer

SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON

{
  "manifest": {
    "error": "SyntaxError: Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
    "id": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2510/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-d1d666c5-4554-4fb3-8b51-4c4e4a02dd0a",
      "cw-9a8b80f4-5649-41d6-926a-08a2946af4f7"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-d56c781a-9848-4819-b794-1095494c9f68",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2510/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-9a8b80f4-5649-41d6-926a-08a2946af4f7"
  }
}