Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/LnLpegn/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-71ce259f-bd2b-40a9-bd11-08e3dd72674b",
      "cw-508360d3-1f50-477d-a2a6-8387fe60ff8d"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-8352c4f0-f4e5-4e3a-98a7-aa3b235a0319",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/LnLpegn/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-508360d3-1f50-477d-a2a6-8387fe60ff8d"
  }
}