Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/YQl6B6d/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-142a4165-31b7-41c5-b1fc-57000663279c",
      "cw-c5bbfc03-af01-4aaa-ad21-ac470da0f849"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a753f03c-b7b0-426b-9c0e-90a99016ae23",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/YQl6B6d/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-c5bbfc03-af01-4aaa-ad21-ac470da0f849"
  }
}