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/p16022coll230/332/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-a37b5b99-0800-45a6-9860-f51e3bd62195",
      "cw-bf042756-274e-4b9f-a30b-4fa3018fb88a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-f90a17db-74cd-4167-8f9b-2085dc5a39d2",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/332/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-bf042756-274e-4b9f-a30b-4fa3018fb88a"
  }
}