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/p16022coll230/2542/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-01f86c88-4f7c-41a7-a7af-10cf53d22f63",
      "cw-50bd3444-42f6-4543-b865-d9c4348dacbf"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-2f903be7-c0da-4db4-b8b2-dd5d0ada2338",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2542/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-50bd3444-42f6-4543-b865-d9c4348dacbf"
  }
}