TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://curate.library.emory.edu/iiif/337vmcvf83-cor/manifest?manifest=https://curate.library.emory.edu/iiif/337vmcvf83-cor/manifest",
    "isFetching": false
  },
  "window": {
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    "companionAreaOpen": true,
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    ],
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    "id": "window-debde52f-fe9a-4310-a090-6d0a9817509e",
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    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-144bd5ed-35d3-4984-818d-7bbfde207426",
    "thumbnailNavigationPosition": "none",
    "allowClose": false,
    "loadedManifest": "https://curate.library.emory.edu/iiif/337vmcvf83-cor/manifest?manifest=https://curate.library.emory.edu/iiif/337vmcvf83-cor/manifest",
    "allowFullscreen": true,
    "allowMaximize": false
  }
}