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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/5KK39Ed/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua757297/0AR6Jg3",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1a5e977b-b6ca-48fb-aa6f-80270658aa20",
      "cw-cd725787-faf0-47b2-a9b1-bd99df13e6f8"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "5KK39Ed",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/5KK39Ed/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-cd725787-faf0-47b2-a9b1-bd99df13e6f8",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}