Mirador viewer

TypeError: Failed to fetch
{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/xnABvEQ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-f5dd70c8-7da6-43b9-9c63-7e5b2f749111",
      "cw-11ce32ba-c0f1-44d1-bc6f-69497a966c05"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-eb79a49e-1316-4b1c-8117-bdd203c55879",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/xnABvEQ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-11ce32ba-c0f1-44d1-bc6f-69497a966c05"
  }
}