Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/ZNnn0yZ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-570d216d-298f-4d83-adb3-0db8af89df80",
      "cw-184797e1-1ca5-4119-9dbc-60538edd8fff"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-0d9f16ae-aaff-4902-ae97-cc29f2e8c253",
    "manifestId": "https://dam.iuav.it/iuav/containers/ZNnn0yZ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-184797e1-1ca5-4119-9dbc-60538edd8fff"
  }
}