TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://www.fina.gov.pl/manifest/superwizja__scenariu_2_manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-3ac7cb09-fc20-4f83-8c51-2672d3777a2f",
      "cw-88e52046-40b1-4d6e-90db-e609adad4310"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-11b695ad-3dce-4060-b8c7-51a76ec77525",
    "manifestId": "https://www.fina.gov.pl/manifest/superwizja__scenariu_2_manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-88e52046-40b1-4d6e-90db-e609adad4310",
    "view": "single"
  }
}