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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/44335/109861/manifest?manifest=/json/iiif/10316.2/44335/109861/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-45be1d88-e8e5-41a2-b147-d148998b7534",
      "cw-f4c6c607-b936-4732-9346-10df6c0fbf87"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-d1b2edb6-88b4-4531-b6a8-1f95b7e8691a",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/44335/109861/manifest?manifest=/json/iiif/10316.2/44335/109861/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-f4c6c607-b936-4732-9346-10df6c0fbf87",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}