Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/w6xrO7e/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua34997919/5dW1zaY",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-efa5fffe-ec63-4e2c-b722-20fc50172413",
      "cw-5f8ae693-c7e9-4bc0-8fbe-d8dffb0198a6"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-5b116ee0-2df0-4cce-8766-526a5f929fb6",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/w6xrO7e/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-5f8ae693-c7e9-4bc0-8fbe-d8dffb0198a6",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}