Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/5VVxrQd/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua34990128/57gDp1P",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-c2d9a296-9238-49e9-abb9-60c7499f5321",
      "cw-21b078df-b14f-4b80-adf5-1d50f98279a6"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-5fdedb8d-b22f-49c3-8668-86eaad770967",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/5VVxrQd/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-21b078df-b14f-4b80-adf5-1d50f98279a6",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}