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/p16022coll289/48/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-a89f1c8d-e00b-4c57-822f-faf4a1a0c66e",
      "cw-44ca5e19-8e12-4a2c-9d5f-6c6ba8580e48"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a53a7ea9-f147-472f-aecb-270aa44b23ce",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll289/48/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-44ca5e19-8e12-4a2c-9d5f-6c6ba8580e48"
  }
}