Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/5KOJPmK/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua550976/5VRkXnO",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-69bafcb6-9e03-4104-b137-fce48b0367ca",
      "cw-fde9c2ca-270e-4d4a-ad4d-316af79989a5"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-89c3f32d-ee44-4f92-886b-d35956b55c5f",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/5KOJPmK/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-fde9c2ca-270e-4d4a-ad4d-316af79989a5",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}