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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/LalnnDb/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua1760804/Lz6RRzJ",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-cbd8ce88-aa54-4685-9a11-51bbec8fc355",
      "cw-f15983fe-2f06-42d6-96f3-06ad97333bc3"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-b2061892-f935-4fa4-91a4-30b343de1679",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/LalnnDb/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-f15983fe-2f06-42d6-96f3-06ad97333bc3",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}