Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/rn0aleQ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-bd5aa181-f2d7-4695-94a9-08229add88a8",
      "cw-be0c1fb7-d086-48ef-84fe-067a40a53f26"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a19d1ba4-b5f1-452a-a0f9-06e8f11c824d",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/rn0aleQ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-be0c1fb7-d086-48ef-84fe-067a40a53f26"
  }
}