Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/XQ7EjPd/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1149e8fc-4777-41ef-9ec3-6c825c34ad7d",
      "cw-8faae1cc-3a98-4375-a603-c6f92e647054"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-6eadc94c-295a-438c-8ea9-8f8b2621f9ff",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/XQ7EjPd/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-8faae1cc-3a98-4375-a603-c6f92e647054"
  }
}