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/p16022coll230/3495/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-7815ed19-ffc7-4035-ad5a-ce98b54faf09",
      "cw-e0b28544-aed6-46fe-bdc2-7778b8a5ac50"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-fa818f05-b7d3-4357-832c-a23a467575f7",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/3495/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-e0b28544-aed6-46fe-bdc2-7778b8a5ac50"
  }
}