Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/vQBAXvn/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-90ff826e-dced-4ee6-9f68-a3826938899f",
      "cw-de571e6e-cb0e-4149-aa69-2fb6f128f901"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e1a8b912-d1ba-48b8-82de-8bf8df8f2914",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/vQBAXvn/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-de571e6e-cb0e-4149-aa69-2fb6f128f901"
  }
}