Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/ZnkOkkv/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-481d2be6-da23-4127-84ac-f57190662a08",
      "cw-82cc7f26-1050-4732-899c-0cd17da847f2"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-cdf542e2-5f1d-4777-98d4-5d24be005d6b",
    "manifestId": "https://dam.iuav.it/iuav/containers/ZnkOkkv/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-82cc7f26-1050-4732-899c-0cd17da847f2"
  }
}