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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/42940/104802/manifest?manifest=/json/iiif/10316.2/42940/104802/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-cc1e863f-3b8a-4183-aa25-aa484238043e",
      "cw-68bbb48c-5943-4e5b-98f1-2e78efc119be"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-b1319dc9-69bc-41d8-8cc9-0c868441d4de",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/42940/104802/manifest?manifest=/json/iiif/10316.2/42940/104802/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-68bbb48c-5943-4e5b-98f1-2e78efc119be",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}