Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/kQN3XpD/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-9a660889-d3f1-4233-a2ad-ae519b29829d",
      "cw-736649ba-cbea-4571-b6ec-fde6dddfafeb"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-000ab3bd-05bc-4a55-8f1b-bf5ab351a6be",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/kQN3XpD/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-736649ba-cbea-4571-b6ec-fde6dddfafeb"
  }
}