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_ua34997919/5vyEndp",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-9370da06-1c6b-46c8-aa3f-b818b2758b18",
      "cw-b8645a5c-e417-4b55-9258-ef5e92a137a6"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-1a89a847-3a2d-44fc-92ae-70aa20ffd293",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/w6xrO7e/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-b8645a5c-e417-4b55-9258-ef5e92a137a6",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}