Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/rvG6lYZ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-b8c3c083-a33c-48b3-9aef-94b8e14246b2",
      "cw-67f5388a-482c-443a-836e-f7e0d200e16a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-de07121f-b9ab-46dc-8921-37a5a8bffb66",
    "manifestId": "https://dam.iuav.it/iuav/containers/rvG6lYZ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-67f5388a-482c-443a-836e-f7e0d200e16a"
  }
}