Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iccu.sbn.it/edit16_393/containers/aQWkj9d/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-dc2f0f42-a43e-48a1-bf11-d300104eb5a4",
      "cw-6f20301d-f71f-4372-a129-71026cb5113d"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": true,
    "id": "main-window",
    "manifestId": "https://dam.iccu.sbn.it/edit16_393/containers/aQWkj9d/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-6f20301d-f71f-4372-a129-71026cb5113d"
  }
}