Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/Zn5Eomn/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-132915bf-f544-493a-be68-bcbcead3c20f",
      "cw-3106d97c-5c0b-4933-8630-6dbdc2ef98dc"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-378382e3-6637-4aa7-8ad0-35c8b9b3efa2",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/Zn5Eomn/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-3106d97c-5c0b-4933-8630-6dbdc2ef98dc"
  }
}