Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/0Ak1gpz/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua34971131/LeWxdA6",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-f5f5cb52-01f5-443c-897b-ac73dd5dce22",
      "cw-8793f0aa-f135-4b26-9c13-87b39ed858b0"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-d9c3d510-d2c4-49ff-9f50-5423753b88df",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/0Ak1gpz/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-8793f0aa-f135-4b26-9c13-87b39ed858b0",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}