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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/43491/106644/manifest?manifest=/json/iiif/10316.2/43491/106644/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-a41669f1-7fce-4466-9d99-53cf8a85c218",
      "cw-b19449cd-3024-46db-beae-6bbf10c32caf"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-0e374f44-5169-42aa-9c48-e5b25e7d6401",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/43491/106644/manifest?manifest=/json/iiif/10316.2/43491/106644/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-b19449cd-3024-46db-beae-6bbf10c32caf",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}