Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/2QENy3D/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-fcc85d5f-cc08-4b9c-b1aa-978f2d06fda7",
      "cw-df034be9-6470-4a4a-9681-0dafd7f999e3"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-95782085-750d-4c65-80b9-0910d73eee2f",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/2QENy3D/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-df034be9-6470-4a4a-9681-0dafd7f999e3"
  }
}