Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/ZNnRNnZ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-9377dd66-fcd4-4258-b434-2f1156c50c3c",
      "cw-db6a8568-41cf-45fa-9d2b-c2ca628a69c8"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-263b450e-1958-4940-a799-eda4a4d413ac",
    "manifestId": "https://dam.iuav.it/iuav/containers/ZNnRNnZ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-db6a8568-41cf-45fa-9d2b-c2ca628a69c8"
  }
}