Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/ZNnG9GZ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-d91c6fb4-dc8f-4d00-b15e-3c127800e292",
      "cw-61dadca1-9d5f-436b-9a56-83a3ca86d589"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-99f85d58-2054-4891-9af5-77c4acb67bd3",
    "manifestId": "https://dam.iuav.it/iuav/containers/ZNnG9GZ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-61dadca1-9d5f-436b-9a56-83a3ca86d589"
  }
}