> For the complete documentation index, see [llms.txt](https://docs.icpc1hn.work/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.icpc1hn.work/2.-huong-dan-du-dung-app-icpc1hn/cuoc-hen-check-call/loi-check-call.md).

# Lỗi check call

<figure><img src="/files/PQtqw2YsOVIy077kYkpt" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/d3ju8yV6VQoy016MpxDn" alt=""><figcaption></figcaption></figure>