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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/71546/120205/manifest?manifest=/json/iiif/10316.2/71546/120205/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-49174295-35c2-4dfa-a4fe-80ea52c69a57",
      "cw-b7d0dc9b-66bc-4327-a467-d1b89035a13f"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-87c6f4d9-0168-41fc-9056-67108b411948",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/71546/120205/manifest?manifest=/json/iiif/10316.2/71546/120205/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-b7d0dc9b-66bc-4327-a467-d1b89035a13f",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}