TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://curate.library.emory.edu/iiif/1504xgxdp9-cor/manifest?manifest=https://curate.library.emory.edu/iiif/1504xgxdp9-cor/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
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      "cw-270b55fe-30ad-4424-8d01-5232819cd40b"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-b852018c-c060-4ad6-9445-cdfff14b83eb",
    "manifestId": "https://curate.library.emory.edu/iiif/1504xgxdp9-cor/manifest?manifest=https://curate.library.emory.edu/iiif/1504xgxdp9-cor/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-270b55fe-30ad-4424-8d01-5232819cd40b",
    "thumbnailNavigationPosition": "none",
    "allowClose": false,
    "loadedManifest": "https://curate.library.emory.edu/iiif/1504xgxdp9-cor/manifest?manifest=https://curate.library.emory.edu/iiif/1504xgxdp9-cor/manifest",
    "allowFullscreen": true,
    "allowMaximize": false
  }
}