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/p16022coll624/331/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-83f25195-557c-4c37-b149-07c41a3850b5",
      "cw-421095aa-41d0-445e-815c-e33dac5807a3"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a05e4dcc-dcd0-4345-b06c-663f591ae7bf",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/331/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-421095aa-41d0-445e-815c-e33dac5807a3"
  }
}