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/p16022coll206/314/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-4e16d697-cbb1-433f-b8eb-22e974e74796",
      "cw-7eafa89a-4656-49f1-a549-3ca653017d81"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-89e30864-fd59-4258-a9d6-c91e8aa0388f",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll206/314/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-7eafa89a-4656-49f1-a549-3ca653017d81"
  }
}