The entry point exited without ever building an IHost

I try to run integration tests and get this error

System.InvalidOperationException: The entry point exited without ever building an IHost. at Microsoft.Extensions.Hosting.HostFactoryResolver.HostingListener.CreateHost() at Microsoft.Extensions.Hosting.HostFactoryResolver.<>c__DisplayClass10_0.b__0(String[] args) at Microsoft.AspNetCore.Mvc.Testing.DeferredHostBuilder.Build() at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory1.CreateHost(IHostBuilder builder) at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory1.ConfigureHostBuilder(IHostBuilder hostBuilder) at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory1.EnsureServer() at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory1.CreateDefaultClient(DelegatingHandler[] handlers) at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory1.CreateDefaultClient(Uri baseAddress, DelegatingHandler[] handlers) at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory1.CreateClient(WebApplicationFactoryClientOptions options) at Ptco.System.IntegrationTests.Infrastructure.IntegrationTestsWebFactory.CreteManagedClient() in C:\Users\nemes\Documents\GitHub\ptco.app\System\Ptco.System.IntegrationTests\Infrastructure\IntegrationTestsWebFactory.cs:line 249

Row 249 is

private HttpClient CreteManagedClient() =>
        CreateClient(new WebApplicationFactoryClientOptions
        {
            BaseAddress = new Uri(_configuration.GetValue<string>("IntegrationServerBaseUri"))
        });

That is called like this

     public IntegrationTestsWebFactory()
#pragma warning restore CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
        {
            _configurationPath = Path.Join(AppDomain.CurrentDomain.BaseDirectory, "appsettings.json");
            _configuration = BuildConfiguration();
            ManagedHttpClient = CreteManagedClient();
        }

How I can solve this error?