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/p16022coll624/105/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-0ed5aae6-0f09-4275-9f52-cea0ffec2350",
      "cw-6ffb180d-babf-4f2c-8995-5b6472654ce4"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-459191bf-0c6f-4e58-98df-e809fb47e68b",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/105/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-6ffb180d-babf-4f2c-8995-5b6472654ce4"
  }
}