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/LzljYRG",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-fbbf1054-9b3e-41e7-98da-8fe5cf903376",
      "cw-6bd20a26-9db6-4ba9-83fe-29eb92478b88"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a4f7cdd4-965e-4956-8673-3070322407a6",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/w6xrO7e/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-6bd20a26-9db6-4ba9-83fe-29eb92478b88",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}