Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/ZNnqLkZ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-dc45ff8a-7bd3-4770-b5af-85a274e0d2a9",
      "cw-b7f42381-c391-4ffc-a07a-6d247fae2dee"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e5367ecd-ce84-49fa-a3e9-a98169b79986",
    "manifestId": "https://dam.iuav.it/iuav/containers/ZNnqLkZ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-b7f42381-c391-4ffc-a07a-6d247fae2dee"
  }
}