Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/w9PWjop/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua35043218/LoJ489V",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-5835d9d6-5957-4b5c-93e4-67f7ac78bf10",
      "cw-74efcbc3-c7b5-4454-a652-9eb72b2420a6"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-ac31994e-1e75-44cf-a989-7502db53da3b",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/w9PWjop/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-74efcbc3-c7b5-4454-a652-9eb72b2420a6",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}