Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/3ZpDq9Z/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-0e459f23-b5f2-446a-8710-93cf109e3f16",
      "cw-231661bf-17f2-4565-9b82-46308973feee"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-f9a6fcaf-09c1-43ed-a4be-462fd4bdc85c",
    "manifestId": "https://dam.iuav.it/iuav/containers/3ZpDq9Z/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-231661bf-17f2-4565-9b82-46308973feee"
  }
}