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/LNXgb8A",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-8ec44141-5de0-4d5f-95e0-e47bab0f9406",
      "cw-87bff1ac-89be-4e1a-a59f-69c3fd16d9c6"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-6d395583-aa20-43ef-b711-cdb65a7bc88c",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/0Ak1gpz/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-87bff1ac-89be-4e1a-a59f-69c3fd16d9c6",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}