Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/5VVOMXV/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua35046131/5KY87P3",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1217c2f3-18a5-4946-96dc-9d0ba3919eed",
      "cw-9ee14353-1f34-499e-af6f-78547540af96"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-fa89de5c-ed6c-4545-8d19-d8fc5e807ed2",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/5VVOMXV/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-9ee14353-1f34-499e-af6f-78547540af96",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}