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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/79032/158619/manifest?manifest=/json/iiif/10316.2/79032/158619/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-c1bdc045-a0dc-4ff6-ab71-93bcd1cd1a70",
      "cw-c80403a5-44a7-46e4-a4af-8cca342b8d11"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-14b70f46-a9c7-49bb-8987-44d964c1b8a3",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/79032/158619/manifest?manifest=/json/iiif/10316.2/79032/158619/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-c80403a5-44a7-46e4-a4af-8cca342b8d11",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}