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/p16022coll289/6/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-ffaffe3a-c0c8-45b4-9d07-ed7f9ba10501",
      "cw-395ed9ee-aa7a-4c16-8b10-65caa81d32f9"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-486a009b-28c1-4fb0-9acd-2f4202197623",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll289/6/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-395ed9ee-aa7a-4c16-8b10-65caa81d32f9"
  }
}