How to fix a "an error occurred while sending the request."

See more:

C#

.NET

My discord bot sometimes throws an exceptions that

An error occurred while sending the request

and I don't know how to fix it and more importantly what should I do. I've set if inner exception is not null then write that out too but it's empty because there is no other information about the exception

What I have tried:

[Command("stats")]
        public async Task Profileosu([Remainder]string username = null)
        {
            try
            {
                string url = String.Format($"http://osu.ppy.sh/api/get_user?k={k}&u={username}");
                using (HttpClient client = new HttpClient())
                {
                        client.BaseAddress = new Uri("http://osu.ppy.sh");
                        client.DefaultRequestHeaders.Accept.Clear();
                        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
                        HttpResponseMessage responseMessage = await client.GetAsync(url);
                        
                         string result = await responseMessage.Content.ReadAsStringAsync();
                         IList<Profile> profile = JsonConvert.DeserializeObject<IList<Profile>>(result);
                   

                    //embedbuild
                    embed.WithThumbnailUrl($"https://a.ppy.sh/{profile.First().user_id}");
                    embed.WithAuthor($"{username} #{profile.First().pp_rank}, {profile.First().pp_raw}PP", Context.Guild.CurrentUser.GetAvatarUrl(), $"https://osu.ppy.sh/users/{profile.First().user_id}");
                    embed.WithDescription($"Join date:{profile.First().join_date}\nCountry:{profile.First().country} #{profile.First().pp_country_rank}\nAccuray:{double.Parse(profile.First().accuracy):F2}%\nPlaycount:{profile.First().playcount}");
                    embed.WithColor(154, 255, 0);
                    await ReplyAsync($"", false, embed.Build());

                }

            }
            catch (Exception ex)
            {

                embed.WithAuthor("An error occured");
                embed.WithDescription("This player doesn't exist, please check the spelling of the username!");
                embed.WithColor(255, 0, 0);
                await ReplyAsync($"", false, embed.Build());
                Console.WriteLine(ex.Message);
                Console.WriteLine(ex.StackTrace);
                if (ex.InnerException != null)
                {
                    Console.WriteLine(ex.InnerException.Message);
                }
                if (ex.InnerException.InnerException.Message != null)
                {
                    Console.WriteLine(ex.InnerException.InnerException.Message);
                }
            }
        }