Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/rn0bAeD/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-83228fe3-fa54-4bd3-a46a-00ce96c68332",
      "cw-b9c5163d-138f-4bc5-917a-28b26714310b"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-d40554fa-0839-4015-9ef5-4017e08fb88e",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/rn0bAeD/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-b9c5163d-138f-4bc5-917a-28b26714310b"
  }
}