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/wlkVlvM",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-0a2e1b47-9d6d-4a53-b607-8c12a5d62a9f",
      "cw-186f9c07-84a6-4a0e-be2f-1e4ab88aeb21"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-3701401c-31f3-4744-9ac6-58d1e6f3303f",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/5KOJPmK/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-186f9c07-84a6-4a0e-be2f-1e4ab88aeb21",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}