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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/70173/114505/manifest?manifest=/json/iiif/10316.2/70173/114505/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-b273d172-8909-43ca-a39f-6a1f0e7ddd39",
      "cw-fa1696e5-3fce-4c9d-938d-c44868cbfe04"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-51db268c-d703-4501-8704-fab1edffb88e",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/70173/114505/manifest?manifest=/json/iiif/10316.2/70173/114505/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-fa1696e5-3fce-4c9d-938d-c44868cbfe04",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}