TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://www.fina.gov.pl/manifest/MCVIqjFI_manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-c3404947-0114-48ad-b1d2-cf54a5e9ffd0",
      "cw-19cf1783-d1a4-4602-bc16-c149032234ec"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-679b0e84-cc51-4593-90f0-8beb2c378bb3",
    "manifestId": "https://www.fina.gov.pl/manifest/MCVIqjFI_manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-19cf1783-d1a4-4602-bc16-c149032234ec",
    "view": "single"
  }
}