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

未指定文件或测试。首先使用 libgit2sharp 0.26.2 以及所示的 PushOptions 和 CredentialsHandler 重现 push，然后检查完整的失败详情和身份验证行为。识别出可重现的原因，并记录或验证 HTTP 500 响应的修复方案，即视为完成。