Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/Zn54Lld/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1a85e653-745b-4d5a-9cbb-83fc1edbd555",
      "cw-a4f033ef-8234-4ad3-9ea6-8e458c3a3982"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-d8d4bf38-8c2a-47f8-ade4-907945053086",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/Zn54Lld/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-a4f033ef-8234-4ad3-9ea6-8e458c3a3982"
  }
}