Mirador viewer

SyntaxError: Unexpected end of JSON input

{
  "manifest": {
    "error": "SyntaxError: Unexpected end of JSON input",
    "id": "https://manifests.collections.yale.edu/ycba/obj/40820",
    "isFetching": false
  },
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    "companionAreaOpen": true,
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    "highlightAllAnnotations": false,
    "id": "window-b364a845-b35e-4167-9bec-202f829ddc0d",
    "manifestId": "https://manifests.collections.yale.edu/ycba/obj/40820",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-262d53ad-3d12-4d80-9f36-eafd16c81ea7"
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}