TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://www.fina.gov.pl/manifest/ostatni_prom__scenar_6_manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-388b5946-0d62-4e48-99c5-88d1ade37a51",
      "cw-7df884b8-f8e1-45f5-8694-f54a3f16b86c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-ff6b459d-c8a5-4da5-86a9-39c4c7c54ca4",
    "manifestId": "https://www.fina.gov.pl/manifest/ostatni_prom__scenar_6_manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-7df884b8-f8e1-45f5-8694-f54a3f16b86c",
    "view": "single"
  }
}