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-872273dd-ccd5-41db-8ff0-d9ad7b67a2af",
      "cw-2d31dcd3-e79e-41ed-86ea-eabae6673b45"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a411ac19-51c2-44b2-a0bb-af78653d912c",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/5KOJPmK/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-2d31dcd3-e79e-41ed-86ea-eabae6673b45",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}