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/p16022coll229/204/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-49dd6400-600e-4e6f-815c-057e612ea212",
      "cw-290e3084-7ca3-4b48-b21a-9df395b9b210"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-c7815941-faed-421b-85b8-06f136a5b5a4",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll229/204/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-290e3084-7ca3-4b48-b21a-9df395b9b210"
  }
}