Mirador viewer

SyntaxError: Unexpected end of JSON input

{
  "manifest": {
    "error": "SyntaxError: Unexpected end of JSON input",
    "id": "https://manifests.collections.yale.edu/ycba/obj/56764",
    "isFetching": false
  },
  "window": {
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    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
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      "cw-f6862182-e2dd-429f-a82d-934f30b17fb3"
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    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-16566482-89a6-47db-9a64-5688b82719c1",
    "manifestId": "https://manifests.collections.yale.edu/ycba/obj/56764",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-f6862182-e2dd-429f-a82d-934f30b17fb3"
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}