Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/8DKpZad/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-8252f989-e5c0-4b2f-95fe-d6ec269b00b4",
      "cw-9f59fc29-1546-4223-a9d5-723226357642"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-56de3c81-264e-426c-bf1e-3276ebee301d",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/8DKpZad/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-9f59fc29-1546-4223-a9d5-723226357642"
  }
}