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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/70677/116750/manifest?manifest=/json/iiif/10316.2/70677/116750/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-79a58c4c-10e1-4974-945c-2ce8e97a76a1",
      "cw-e6cf3a13-bad7-4d21-a9d2-177dde62fbef"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-6081bd72-130a-4018-84e6-13b7af6df8c1",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/70677/116750/manifest?manifest=/json/iiif/10316.2/70677/116750/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-e6cf3a13-bad7-4d21-a9d2-177dde62fbef",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}