Mirador viewer

TypeError: Failed to fetch
{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/xnAEXxn/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-810082dc-4443-482a-a9e7-6feb76099ed0",
      "cw-ab479b69-c25c-49c9-a99b-beedb5479d73"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-0b2f07d8-26e1-4b46-88e6-845bd6c98131",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/xnAEXxn/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-ab479b69-c25c-49c9-a99b-beedb5479d73"
  }
}