Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/nv7NgjZ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-fda7142e-c072-45ce-bc13-b7d9008b88ee",
      "cw-602fd928-ddc2-462a-9b81-ae030a99329e"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-7a2f6855-8577-4cfa-a689-92dba71fe4a3",
    "manifestId": "https://dam.iuav.it/iuav/containers/nv7NgjZ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-602fd928-ddc2-462a-9b81-ae030a99329e"
  }
}