Error pushing to github using 0.26.2

I'm using 0.26.2 to push files to github, and it gives me request failed with status code 500, and I'm using personal access token of github for authentication.

following is how I create push option
return new PushOptions()
{
CredentialsProvider = CreateCredentialsProvider(),
OnPushStatusError = new PushStatusErrorHandler(error =>
{
throw new NonFastForwardException($"{error.Message} at {error.Reference}");
})
};

and following is how I create Credentials Provider:
return new CredentialsHandler((url, userNameFromUrl, types) =>
{
return new UsernamePasswordCredentials()
{
Username = credential.UserName,
Password = credential.Password ?? string.Empty,
};
});

can somebody help me to find out what's wrong

未指定檔案或測試。首先使用 libgit2sharp 0.26.2 以及所示的 PushOptions 和 CredentialsHandler 重現 push，然後檢查完整的失敗詳細資訊與驗證行為。識別出可重現的原因，並記錄或驗證 HTTP 500 回應的修正方案，即視為完成。