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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/71372/119507/manifest?manifest=/json/iiif/10316.2/71372/119507/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1f3ac95d-219c-46b1-8e46-8775a76b4375",
      "cw-2294498d-50b6-4c5a-ad77-9da9b343944d"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-16521d1a-3583-4c1a-8aa8-63ce5c97259e",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/71372/119507/manifest?manifest=/json/iiif/10316.2/71372/119507/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-2294498d-50b6-4c5a-ad77-9da9b343944d",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}