Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/03473k8/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua35040528/LpWXOVl",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-ec67ff9c-7771-4346-a293-4c7c225294c6",
      "cw-a34f6025-d015-4932-843d-34a24ccae49f"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-31f4c58c-71a3-4b0c-a6af-51f21c8a2515",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/03473k8/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-a34f6025-d015-4932-843d-34a24ccae49f",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}