Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/xnA5jnw/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-8f61129c-ae3d-42f4-9bf2-296cdb26532a",
      "cw-9f35bd42-5c47-4508-966b-fa4936b9ac19"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-24f6858b-745c-4422-89b9-3a0676a9d9d9",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/xnA5jnw/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-9f35bd42-5c47-4508-966b-fa4936b9ac19"
  }
}