Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/wdVXqNQ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-15769406-36b6-4bf8-a2a7-7f4b95eec295",
      "cw-de48346a-0195-4a3b-87cb-5792fd43bf6c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-d7101a76-497d-4c38-bc02-852b2e9824c7",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/wdVXqNQ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-de48346a-0195-4a3b-87cb-5792fd43bf6c"
  }
}