Mirador viewer

SyntaxError: Unexpected end of JSON input

{
  "manifest": {
    "error": "SyntaxError: Unexpected end of JSON input",
    "id": "https://manifests.collections.yale.edu/ycba/obj/20556",
    "isFetching": false
  },
  "window": {
    "canvasId": null,
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-53b66009-0f29-497d-921f-b9b67ec36b76",
      "cw-3c7c3589-4353-445c-af90-e821d9b05c35"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-691fb612-9d61-4a98-91ca-7c38f579fda5",
    "manifestId": "https://manifests.collections.yale.edu/ycba/obj/20556",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-3c7c3589-4353-445c-af90-e821d9b05c35"
  }
}