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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/73357/127926/manifest?manifest=/json/iiif/10316.2/73357/127926/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-29943824-9b6f-42f5-a7e3-46a202dbf32c",
      "cw-1192ebc0-818e-4132-b10f-0d30b68695ff"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-c73dcff6-e87e-4234-aa68-6d1eeaf5f20c",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/73357/127926/manifest?manifest=/json/iiif/10316.2/73357/127926/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-1192ebc0-818e-4132-b10f-0d30b68695ff",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}