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/p16022coll624/720/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-3b54a003-306b-45cc-806e-b25ceef1d700",
      "cw-fb2c9581-4edc-4cd1-987d-b85ba6c4fb3f"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e26f2906-98a6-4468-8a52-7453f8ce3d22",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/720/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-fb2c9581-4edc-4cd1-987d-b85ba6c4fb3f"
  }
}