Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/KdPG9KD/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-3cf9f7a3-9484-4663-b8ce-936087f92c42",
      "cw-0519850b-ed73-44e4-afc5-2a78fb300f50"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-f75cea51-1f9a-48c5-ba9e-5a8a2a71d7e5",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/KdPG9KD/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-0519850b-ed73-44e4-afc5-2a78fb300f50"
  }
}