Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/ZNnG9GZ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-83c18a86-e8fd-4b0e-8c3f-b0006d22dfd0",
      "cw-a648cbe3-4834-4ecf-bf50-40c511c6e81e"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-cb71446c-e95c-4672-9859-6f0bf98df650",
    "manifestId": "https://dam.iuav.it/iuav/containers/ZNnG9GZ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-a648cbe3-4834-4ecf-bf50-40c511c6e81e"
  }
}