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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/43482/106553/manifest?manifest=/json/iiif/10316.2/43482/106553/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-94a4886e-2d79-4466-9540-4093029b68f2",
      "cw-d53bcb8e-9dea-413e-8707-e65187ad45a6"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-af4fd164-a6db-471f-8589-d99ee2ccc4f0",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/43482/106553/manifest?manifest=/json/iiif/10316.2/43482/106553/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-d53bcb8e-9dea-413e-8707-e65187ad45a6",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}