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/p16022coll230/2225/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-d0b6c284-39e1-4fa0-8939-dd347ebd8a4f",
      "cw-4e22edda-60c3-401c-a8e1-8da550bca2e9"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-9dbeb66a-5cc1-483c-b0c7-807ba32eaaad",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2225/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-4e22edda-60c3-401c-a8e1-8da550bca2e9"
  }
}