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/p16022coll205/239/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-a6b41964-d9c1-429a-995b-33079d426b52",
      "cw-7ff95577-c450-4057-a17d-7a996bd0ca8c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-18ac984c-c8cb-4d66-9775-cdf014e194eb",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/239/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-7ff95577-c450-4057-a17d-7a996bd0ca8c"
  }
}