Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/w6xrO7e/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua34997919/0M4nlql",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-0bca585b-b7ac-4276-b521-d16670b9a9c3",
      "cw-c2f2eb9b-5d6c-400b-ad9a-9cbc0ed6f667"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-7dce01ce-0415-4dc9-88f4-c910be6ccdd0",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/w6xrO7e/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-c2f2eb9b-5d6c-400b-ad9a-9cbc0ed6f667",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}