C# 添加新用户active directory

我得到这个错误

“服务器不愿意处理此请求”

当我想在active directory中添加用户时 源代码：

public static void SubmitUser(string OU, string username, string password, bool enabled, 
        string givenName)
    {
        using (PrincipalContext ctx = GetPrincipalContext(OU))
        {

            UserPrincipalEx user = UserPrincipalEx.FindByIdentity(ctx, IdentityType.SamAccountName, username);
            if (user == null)
            {

                user = new UserPrincipalEx(ctx);
                user.SamAccountName = username;
                user.SetPassword(password);

            }
            user.Enabled = enabled;


            //if (!string.IsNullOrEmpty(username) && user.SamAccountName != username)
            //{
            //    user.SamAccountName = username;
            //}

            if (!string.IsNullOrEmpty(givenName) && user.GivenName != givenName)
            {
                user.GivenName = givenName;
            }

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帐户是否有创建用户的权限？您是否尝试调用user.CommitChanges（）？在哪一行出现错误？