Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/0Ak7Vl7/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-f97742a8-9721-4e88-81e1-0c2f7f2772d3",
      "cw-0b6f8474-3623-4fb7-914d-347a8eb69d6d"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "0Ak7Vl7",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/0Ak7Vl7/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-0b6f8474-3623-4fb7-914d-347a8eb69d6d",
    "imageToolsEnabled": true,
    "imageToolsOpen": true
  }
}