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/p16022coll230/2570/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1b186aca-4ee5-4197-a422-1eb0ffaf667f",
      "cw-2186f01a-9f8f-4c97-a889-b7e2241bc8bf"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-c7315144-6b55-4fa6-9ee8-d7956c806489",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2570/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-2186f01a-9f8f-4c97-a889-b7e2241bc8bf"
  }
}