Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/vDrkZXd/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-48df11f0-ad53-4a85-8e82-297d8eaa19ef",
      "cw-4e14c3c1-9905-4fae-acdf-a75a8b4d6e13"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-494c5888-c164-4913-a299-54c5e110cfe0",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/vDrkZXd/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-4e14c3c1-9905-4fae-acdf-a75a8b4d6e13"
  }
}