Mirador viewer

SyntaxError: Unexpected end of JSON input

{
  "manifest": {
    "error": "SyntaxError: Unexpected end of JSON input",
    "id": "https://manifests.collections.yale.edu/ycba/obj/21503",
    "isFetching": false
  },
  "window": {
    "canvasId": null,
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-bfdb1ae0-9a26-4bc0-b27c-82bfc21fa025",
      "cw-a1bdf6a3-4b48-4948-8466-5ffc37e19d71"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-3a7de8f9-2123-44c2-9bb0-b19e8fafa3ec",
    "manifestId": "https://manifests.collections.yale.edu/ycba/obj/21503",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-a1bdf6a3-4b48-4948-8466-5ffc37e19d71"
  }
}