Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/bDxBj4n/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-bcb7c457-0772-40de-88d5-414ff2332841",
      "cw-d969f4b2-5c84-4ee6-ae40-f9c6b09b3c91"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-24a87fd1-ec87-4ab0-902f-82ff6cf0542a",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/bDxBj4n/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-d969f4b2-5c84-4ee6-ae40-f9c6b09b3c91"
  }
}