Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/vQBzlkQ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-64f08bbc-72c0-4db7-82f6-c86fa5adbb0d",
      "cw-e4f26d36-278a-4919-8261-7b65c316a30b"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-84146a8c-a727-4d1d-822e-22cbe5536893",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/vQBzlkQ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-e4f26d36-278a-4919-8261-7b65c316a30b"
  }
}