Mirador viewer

SyntaxError: Unexpected end of JSON input

{
  "manifest": {
    "error": "SyntaxError: Unexpected end of JSON input",
    "id": "https://manifests.collections.yale.edu/ycba/obj/21256",
    "isFetching": false
  },
  "window": {
    "canvasId": null,
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
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      "cw-a5651e96-0013-4ee5-8484-69e981a3c350"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-de5f2687-e685-436a-a85d-79c57d75a047",
    "manifestId": "https://manifests.collections.yale.edu/ycba/obj/21256",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-a5651e96-0013-4ee5-8484-69e981a3c350"
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}