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/p16022coll230/1725/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-3a6b8f9f-b356-4741-8d68-62393b927084",
      "cw-7b121478-68fd-41f1-82d4-6cb2111cb463"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-3009510c-f001-4d02-a14f-485d0a35fe51",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/1725/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-7b121478-68fd-41f1-82d4-6cb2111cb463"
  }
}