Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/4DeavYD/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-759d80fa-1aa0-4c94-a12b-e9e4b7a3c1b9",
      "cw-bb5178f3-cd8c-43e7-8ef5-931d17f00d60"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-9d994787-83e1-4ddc-b756-cf64d7b4636c",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/4DeavYD/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-bb5178f3-cd8c-43e7-8ef5-931d17f00d60"
  }
}