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/p16022coll624/805/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-04f9c122-c3d6-40ad-bac7-e4f1c7da3ae2",
      "cw-45cf3fe9-f125-4305-a5c9-a9b78a92f1fb"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-1890968c-0802-4222-a6fb-538bcb478c69",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/805/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-45cf3fe9-f125-4305-a5c9-a9b78a92f1fb"
  }
}