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/p16022coll231/3132/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-7f9ef509-43ed-400b-8160-d87053e279ee",
      "cw-9bb0e7f9-b793-46ad-8f49-14c327a08c3c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-63ef5a87-da16-4020-85a6-925e52841662",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll231/3132/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-9bb0e7f9-b793-46ad-8f49-14c327a08c3c"
  }
}