Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/Lmy9ZEM/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua549020/5vaXRql",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-911d036f-7ac0-4282-bf72-88aabd4f82d5",
      "cw-f0aad3c1-be63-4f1b-b31c-25c8f04a4b3b"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a256304f-eea5-4d9f-9c79-f1815627a8e9",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/Lmy9ZEM/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-f0aad3c1-be63-4f1b-b31c-25c8f04a4b3b",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}