Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/ZNnlk4Z/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-ef3bb8aa-5d30-4a26-9f79-1f989bfb810b",
      "cw-282c0a4e-4ea0-4af1-a007-7754c6cea96f"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-70b296a1-3f45-41fe-a7b7-b8eb1d4a3160",
    "manifestId": "https://dam.iuav.it/iuav/containers/ZNnlk4Z/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-282c0a4e-4ea0-4af1-a007-7754c6cea96f"
  }
}