Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/0Akz7E7/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua35019440/wE9NzKr",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1499dacb-6043-497b-a92f-64e61d003580",
      "cw-4eed7f0b-9b39-46d7-aaef-d142af4ba494"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-8a75cd55-5f18-4aae-8200-9e469fc45c66",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/0Akz7E7/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-4eed7f0b-9b39-46d7-aaef-d142af4ba494",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}