Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/xQMaMvQ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-ef73e867-2e23-4607-a51b-56ade06a9e88",
      "cw-d00581ac-011a-46c7-a5ba-3b4587a99301"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-0f908006-d423-4f0f-88c5-a0f061b3046d",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/xQMaMvQ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-d00581ac-011a-46c7-a5ba-3b4587a99301"
  }
}