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/p16022coll624/485/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-c34eb9a8-6c74-41db-9200-f0a3f7ff3a6f",
      "cw-5f432b6e-8f86-420c-b136-af827c54c58a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-6183cfd6-4136-47f2-b309-b7347c36e787",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/485/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-5f432b6e-8f86-420c-b136-af827c54c58a"
  }
}