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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/44283/109653/manifest?manifest=/json/iiif/10316.2/44283/109653/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-af0724a6-c6b6-469e-a5c3-09752f472b5c",
      "cw-bd14c4a7-005e-43c4-9a26-f4473187d5e6"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e2b81f89-9cc7-4e73-8ed9-c541b0f4e1e4",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/44283/109653/manifest?manifest=/json/iiif/10316.2/44283/109653/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-bd14c4a7-005e-43c4-9a26-f4473187d5e6",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}