TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://www.fina.gov.pl/manifest/znachor__scenariusz_1_manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-55aca4e2-ee35-4125-8b64-1a6719f600fc",
      "cw-aef47f61-3ddc-4601-864a-385f68d97441"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-eef57a4b-6a05-4cc3-af9c-c048da607fdd",
    "manifestId": "https://www.fina.gov.pl/manifest/znachor__scenariusz_1_manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-aef47f61-3ddc-4601-864a-385f68d97441",
    "view": "single"
  }
}