Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/w9Nnxnk/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua549252/5vaXRbD",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-4fb8ed69-53aa-4c1c-93ac-6a89f7fa4ea5",
      "cw-e391804a-65c3-48c9-8df9-d4a8fef0884f"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-3d6413d1-df59-4aac-bc2c-34a12a5b31d3",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/w9Nnxnk/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-e391804a-65c3-48c9-8df9-d4a8fef0884f",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}