Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/rvG6kBZ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-2e8178cb-9dda-4f56-beee-c3ce0a93ffde",
      "cw-de8669db-8299-45d2-99d4-c3ea4f7f9a4e"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-15748705-69f5-4411-86cf-d808fcf00f8d",
    "manifestId": "https://dam.iuav.it/iuav/containers/rvG6kBZ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-de8669db-8299-45d2-99d4-c3ea4f7f9a4e"
  }
}