Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/XDgGYPD/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-920df2fc-fb9e-4277-8624-c2aaa7c30649",
      "cw-35fa77b9-20d7-47a6-94e6-85126854dacd"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-8cdc3490-36af-42d9-a552-64d1b5bb441a",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/XDgGYPD/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-35fa77b9-20d7-47a6-94e6-85126854dacd"
  }
}