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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/73812/130460/manifest?manifest=/json/iiif/10316.2/73812/130460/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-ad8cf879-f9ad-471a-89b2-2409406f2c18",
      "cw-7e9f5ba6-64ce-45fd-919d-e0c214dd7591"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-50acc41c-3e4b-43c4-9529-9d189c96adc3",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/73812/130460/manifest?manifest=/json/iiif/10316.2/73812/130460/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-7e9f5ba6-64ce-45fd-919d-e0c214dd7591",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}