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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/70404/115658/manifest?manifest=/json/iiif/10316.2/70404/115658/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-c9094e00-b3a8-47a5-ae9e-be2b97c180bb",
      "cw-bf9c01af-90d1-4ec5-8966-0d7e66f7c807"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-ad448154-b363-41cd-a651-35a7feff5d8b",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/70404/115658/manifest?manifest=/json/iiif/10316.2/70404/115658/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-bf9c01af-90d1-4ec5-8966-0d7e66f7c807",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}