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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/95227/281580/manifest?manifest=/json/iiif/10316.2/95227/281580/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-d928abe3-a856-47ab-b646-2f7d64af1f19",
      "cw-43b1aab8-b9fc-4235-bd03-2b62ba0a3604"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-0b0ca14a-5807-42b9-95b9-a25ee5188552",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/95227/281580/manifest?manifest=/json/iiif/10316.2/95227/281580/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-43b1aab8-b9fc-4235-bd03-2b62ba0a3604",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}