Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/ZNnn6GZ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-ac75e423-ce30-4e89-8156-c6d613e1adb8",
      "cw-f49d0dd9-3d25-46e3-8ff0-8e30c102cd82"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-70999399-f28d-49e8-b9ba-aafeb6a6a36a",
    "manifestId": "https://dam.iuav.it/iuav/containers/ZNnn6GZ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-f49d0dd9-3d25-46e3-8ff0-8e30c102cd82"
  }
}