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/p16022coll289/28/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-bd646fab-c06e-439b-9762-dedf72aba21c",
      "cw-12b97c59-7be6-4f35-8bd4-dc33dfe7d97e"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-28a95d00-d7dd-42b5-8073-8a028e805f18",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll289/28/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-12b97c59-7be6-4f35-8bd4-dc33dfe7d97e"
  }
}