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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/97297/287554/manifest?manifest=/json/iiif/10316.2/97297/287554/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-6d301181-e0ca-4f89-8b89-465e8b58cd06",
      "cw-39b9fa6d-cb6a-4acf-bb3d-49e0cbe6a185"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-ffdcb1de-7cdf-4e21-9a2d-49e350438061",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/97297/287554/manifest?manifest=/json/iiif/10316.2/97297/287554/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-39b9fa6d-cb6a-4acf-bb3d-49e0cbe6a185",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}