Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/9AV4aGZ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-6b77287b-842a-4db7-961a-c49d0a37a2b1",
      "cw-6f828d37-9a07-4734-806a-c18d8bd1f705"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-2f144f23-6af8-4f28-94ae-e291e7c72493",
    "manifestId": "https://dam.iuav.it/iuav/containers/9AV4aGZ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-6f828d37-9a07-4734-806a-c18d8bd1f705"
  }
}