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/p16022coll230/3317/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-65443470-debc-4559-ad55-2223257330a3",
      "cw-5ecb7913-2ad1-4e89-b069-9b0176ce3921"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-1420d251-db26-43fe-a4e1-43dafc3c0712",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/3317/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-5ecb7913-2ad1-4e89-b069-9b0176ce3921"
  }
}