Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/JvalpDZ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-90b69fbd-5461-4ff4-94d6-fb9ce1253bfe",
      "cw-b41c66c0-7510-4a06-a7b1-c9d50ae2e740"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-ef289e98-f8e8-495a-b895-9afee1ce0f3a",
    "manifestId": "https://dam.iuav.it/iuav/containers/JvalpDZ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-b41c66c0-7510-4a06-a7b1-c9d50ae2e740"
  }
}