Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/Z81qoVv/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-82eb9fe9-e2aa-42bc-8fd1-38c0d119e3e5",
      "cw-a87e8be5-6caa-40f8-9497-1c706c315f6a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-56a833d0-da04-4c70-a3ea-dbb86d46318f",
    "manifestId": "https://dam.iuav.it/iuav/containers/Z81qoVv/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-a87e8be5-6caa-40f8-9497-1c706c315f6a"
  }
}