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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/71810/121256/manifest?manifest=/json/iiif/10316.2/71810/121256/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-e5f8e3c2-1f4e-4d25-a848-2199e6fa427d",
      "cw-4d5efed4-0f9b-4f99-8ba6-8b2e50830a27"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-6438630a-d205-47dd-a30f-2ac8c275501e",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/71810/121256/manifest?manifest=/json/iiif/10316.2/71810/121256/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-4d5efed4-0f9b-4f99-8ba6-8b2e50830a27",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}