Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/3Zp8jMZ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-cd301c6c-2d79-4fb2-a55b-e560b05b23f4",
      "cw-4be64057-507a-4dcd-924d-e5cd75d1327c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-891de6cd-5c11-46c2-bd77-7e9558488d05",
    "manifestId": "https://dam.iuav.it/iuav/containers/3Zp8jMZ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-4be64057-507a-4dcd-924d-e5cd75d1327c"
  }
}