Mirador viewer

SyntaxError: Unexpected end of JSON input

{
  "manifest": {
    "error": "SyntaxError: Unexpected end of JSON input",
    "id": "https://manifests.collections.yale.edu/ycba/obj/12420",
    "isFetching": false
  },
  "window": {
    "canvasId": null,
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-f8969d3c-d7d9-4584-8743-ee7f735c033c",
      "cw-e0515f48-92b5-487e-9bf3-b550c40cdac5"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a607e984-da43-4421-8e19-a8940f2007e9",
    "manifestId": "https://manifests.collections.yale.edu/ycba/obj/12420",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-e0515f48-92b5-487e-9bf3-b550c40cdac5"
  }
}