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/p16022coll205/351/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-eb340f81-9ed9-4c71-b380-8454562f28c6",
      "cw-c5f424fa-6567-4bd0-b422-f17c507c1bd3"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-3e3345e8-9cfd-42e1-b337-5e6208377f07",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/351/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-c5f424fa-6567-4bd0-b422-f17c507c1bd3"
  }
}