Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/3ZpxkpZ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-8f4f4790-6ba3-40e0-863a-2a4d6b79ccaa",
      "cw-3637853e-0b90-4be4-9973-b24fe64be409"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-7bba94ae-ae67-46fb-bb57-8d1d9d79ee9a",
    "manifestId": "https://dam.iuav.it/iuav/containers/3ZpxkpZ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-3637853e-0b90-4be4-9973-b24fe64be409"
  }
}