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/p16022coll289/31/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-8cd027af-0385-4476-98d3-05eaa42ab9ba",
      "cw-aaf01c50-d1ca-4d09-a2c0-69af13c4c0a3"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-fedfd6c5-3382-40e1-9995-ec865501d67a",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll289/31/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-aaf01c50-d1ca-4d09-a2c0-69af13c4c0a3"
  }
}