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/p16022coll230/1500/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-b5e43bf7-ac4d-4045-a39b-590addde4197",
      "cw-03da8caa-fa3b-4f79-9279-7f62d5f69d5e"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-62d6b8e4-c6e7-45e5-8e96-76711bfb7eb9",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/1500/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-03da8caa-fa3b-4f79-9279-7f62d5f69d5e"
  }
}