Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iccu.sbn.it/edit16_888/containers/lejn6ye/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-4ddec7a9-96ba-4c03-bc5c-6faf2d13d41d",
      "cw-18bcb7c3-f54d-46a9-b6b7-336cb37f1d26"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": true,
    "id": "main-window",
    "manifestId": "https://dam.iccu.sbn.it/edit16_888/containers/lejn6ye/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-18bcb7c3-f54d-46a9-b6b7-336cb37f1d26"
  }
}