Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/Zn5Eaon/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-0319a999-9a59-4a93-9daa-b0f852b262c8",
      "cw-6223dbb0-647e-4934-9d0b-72a0a80aaf27"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-03da08e4-19b4-4e07-a7c2-5cb30fd0996f",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/Zn5Eaon/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-6223dbb0-647e-4934-9d0b-72a0a80aaf27"
  }
}