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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/69307/110413/manifest?manifest=/json/iiif/10316.2/69307/110413/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-efdc0ae4-6f1c-4677-b37a-15b1aa5e3ee3",
      "cw-38e875a2-396a-4d96-87ca-4e4027e11c13"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-6ede379f-61ec-4b6d-9061-1e275888992b",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/69307/110413/manifest?manifest=/json/iiif/10316.2/69307/110413/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-38e875a2-396a-4d96-87ca-4e4027e11c13",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}