Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/ZNnR2BZ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-21b7fd81-20a2-4107-97dc-9cddf1237fa2",
      "cw-a26f717a-3df2-41bb-b9da-c97f2d0f5cf9"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a54e7e06-86fa-4cfd-837d-1e117a5f7112",
    "manifestId": "https://dam.iuav.it/iuav/containers/ZNnR2BZ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-a26f717a-3df2-41bb-b9da-c97f2d0f5cf9"
  }
}