Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/Lzl8eXg/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua34971074/LoJ6pvA",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-0eddd2d8-4b7e-4289-be47-2e2f8247b017",
      "cw-1061cae7-d5e6-4eea-9337-31e4d4df2534"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-ff3b4c11-0649-4470-b9b5-11ffdada8d44",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/Lzl8eXg/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-1061cae7-d5e6-4eea-9337-31e4d4df2534",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}