Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/03473k8/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua35040528/LpWXOVl",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-2e107101-691d-47d8-a3bf-0cf0439aa45d",
      "cw-62625679-8dd3-46d4-8423-5536531af990"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-f923b5bb-7b90-4666-bce5-455e7b3f6ba1",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/03473k8/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-62625679-8dd3-46d4-8423-5536531af990",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}