Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/5KOJPmK/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua550976/5YJpZag",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-d3a425dc-d8f7-43cf-87fb-f3c50ed1236b",
      "cw-bdbc5e37-3c69-40e2-8f33-d102ed60c325"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-70b10e33-502b-4d85-b0fb-c1e11797dfe4",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/5KOJPmK/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-bdbc5e37-3c69-40e2-8f33-d102ed60c325",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}