Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/0Q4YGOD/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-40144920-f296-411b-be63-99c6a283a844",
      "cw-d6892193-2c4c-487f-9858-6ab0e8abdc32"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-dd2d5c52-c54f-4677-9c71-193b7be2b11a",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/0Q4YGOD/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-d6892193-2c4c-487f-9858-6ab0e8abdc32"
  }
}