Mirador viewer

TypeError: Failed to fetch
{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/xnAVbLQ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-44c06b51-72f6-442e-9205-33614cd8eabc",
      "cw-0866cc03-988a-48f2-a946-5be64fb58c97"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-9ac14402-2a7e-4840-aa76-67f50955ae08",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/xnAVbLQ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-0866cc03-988a-48f2-a946-5be64fb58c97"
  }
}