Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/ZNnwK4Z/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-7f8c1f3d-7bda-4fab-9c7a-21be0afc5ae0",
      "cw-7a73f8da-c195-432d-9d4a-fdad4c50254e"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-01837f7d-8f05-416a-b0e3-c90140616a15",
    "manifestId": "https://dam.iuav.it/iuav/containers/ZNnwK4Z/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-7a73f8da-c195-432d-9d4a-fdad4c50254e"
  }
}