Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/03473k8/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua35040528/Ly9mM71",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-89f5208b-1ab0-465b-b8f5-d00137f2d3ab",
      "cw-3f625b43-d3a7-4ead-b374-8b6e42ccc58d"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-2a19e409-3774-4987-a73e-80f6a4b17bbe",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/03473k8/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-3f625b43-d3a7-4ead-b374-8b6e42ccc58d",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}