Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/JnRmMd5/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-38727899-6065-40cf-a2ce-f0de0cfd46fc",
      "cw-f77b5f2b-ffcd-47ea-9b90-8e7c4aa1bdb5"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-08e7ad60-16f1-4cb0-9487-c1ee15b1908c",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/JnRmMd5/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-f77b5f2b-ffcd-47ea-9b90-8e7c4aa1bdb5"
  }
}