Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/KdPOKZD/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-3a573dee-4b98-4236-8bea-959e9c2c5927",
      "cw-7f904ae1-e044-47dc-a1a3-211c4982a7eb"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-8d701c87-86b7-4233-8f80-08805a6b5ddb",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/KdPOKZD/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-7f904ae1-e044-47dc-a1a3-211c4982a7eb"
  }
}