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/wQgqdVq",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-feefdf65-e58f-446c-9504-c962256ddaaa",
      "cw-b6731e48-58f2-40c3-9b92-b7ba2b723ddc"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-f9110697-b37e-4b0b-9494-7d168483213e",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/03473k8/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-b6731e48-58f2-40c3-9b92-b7ba2b723ddc",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}