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/wE9r8QM",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-d4786173-d51e-481b-b812-aa2719382fde",
      "cw-419dbbb7-03d4-4d25-bf80-ef788faa8a75"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-c21e372a-3969-4ea4-b7c5-9014558c622f",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/w9PWjop/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-419dbbb7-03d4-4d25-bf80-ef788faa8a75",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}