Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/LnLYerQ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-39b8cfe7-e6fc-4460-8f40-f5fa94c5c0b4",
      "cw-64a42fcb-850a-4983-ac74-1ef6ade9ba51"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-7afb01b6-66ae-470d-a5cd-5c7e2a8ed17a",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/LnLYerQ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-64a42fcb-850a-4983-ac74-1ef6ade9ba51"
  }
}