Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/KdPokjD/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-99433e11-14da-4d4c-b82e-146b01a08d3e",
      "cw-83222f7f-e68d-400e-95b4-96e8a46f3ffa"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-6695cee8-d557-4298-970a-2236ef2cc1c4",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/KdPokjD/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-83222f7f-e68d-400e-95b4-96e8a46f3ffa"
  }
}