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/p16022coll230/2562/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-dc60ce69-5b49-461b-b7a8-f9449aa44930",
      "cw-4477db6a-533f-4540-b41c-91760a477c4d"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-1960bc46-50ef-425d-909f-5dfad3a0775e",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2562/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-4477db6a-533f-4540-b41c-91760a477c4d"
  }
}