Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/Xd8qbxn/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-edbcb286-50dc-4b1e-8d5c-ce75d08657dd",
      "cw-415abcae-def2-4ed2-b3c9-125c7302912e"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-4071e32a-1ccb-450e-97c0-cb64c30b97b5",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/Xd8qbxn/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-415abcae-def2-4ed2-b3c9-125c7302912e"
  }
}