Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/nv7NgjZ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-afb163a6-46b8-42e3-bc5e-7d9e01924cc4",
      "cw-4acadb6d-500e-4cd0-9530-adbce9e34349"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-cf7dddf3-036e-48e3-b585-ef452cfe3749",
    "manifestId": "https://dam.iuav.it/iuav/containers/nv7NgjZ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-4acadb6d-500e-4cd0-9530-adbce9e34349"
  }
}