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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/73463/128611/manifest?manifest=/json/iiif/10316.2/73463/128611/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-f28c602a-017e-4020-a717-f1c071aeb547",
      "cw-4ae019f8-1256-4414-a792-2c8a3871c165"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-57994d67-2be3-468a-87cd-640aa85a341a",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/73463/128611/manifest?manifest=/json/iiif/10316.2/73463/128611/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-4ae019f8-1256-4414-a792-2c8a3871c165",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}