question

Hello, first time user here. I'm trying to test the most basic code sample for C# but it isn't working and it's throwing a very vague exception. Code and exception below. I replaced the sensitive variables with comments describing what they had been set to.

using System;
using System.Threading.Tasks;
using RingCentral;
using DotNetEnv;

namespace Call_Ringout
{
    class Program
    {
        static RestClient restClient;
        static void Main(string[] args)
        {
            restClient = new RestClient(
                /*Client ID*/,
                /*Client Secret*/,
                "https://platform.devtest.ringcentral.com");
            restClient.Authorize(
                /*Username*/,
                /*Extension*/,
                /*Password*/;
            call_ringout().Wait();
        }

        static private async Task call_ringout()
        {
            var parameters = new MakeRingOutRequest();
            parameters.from = new MakeRingOutCallerInfoRequestFrom
            {
                phoneNumber = /*From Number*/
            };
            parameters.to = new MakeRingOutCallerInfoRequestTo
            {
                phoneNumber = /*To Number*/
            };
            parameters.callerId = new MakeRingOutCallerInfoRequestTo
            {
                phoneNumber = /From Number/
            };
            parameters.country = new MakeRingOutCoutryInfo
            {
                id = "1"
            };
            parameters.playPrompt = false;
            //var resp = await restClient.Restapi().Account().Extension().RingOut().Post(parameters);
            //Console.WriteLine("Call Placed. Call status" + resp.status.callStatus);

            var _1 = restClient.Restapi();
            var _2 = _1.Account();
            var _3 = _2.Extension();
            var _4 = _3.RingOut();
            try
            {
                var resp = await _4.Post(parameters);
                Console.WriteLine("Call Placed. Call status" + resp.status.callStatus);
            }
            catch(Exception e)
            {
                Console.WriteLine(e.InnerException);
                Console.WriteLine(e.Message);
                Console.WriteLine(e.ToString());
            }
        }
    }
}

I broke up the line

var resp = await restClient.Restapi().Account().Extension().RingOut().Post(parameters);

Into its component parts to see where the problem is. It is in the last part, which is why I put the try block around it alone.

Here is the error I'm getting:

Object reference not set to an instance of an object.
System.NullReferenceException: Object reference not set to an instance of an object.
   at RingCentral.RestClient.Request(HttpRequestMessage httpRequestMessage, Int32 retriedTimes, Nullable`1 cancellationToken)
   at RingCentral.RestClient.Request(HttpMethod httpMethod, String endpoint, Object content, Object queryParams, Nullable`1 cancellationToken)
   at RingCentral.RestClient.Request[T](HttpMethod httpMethod, String endpoint, Object content, Object queryParams, Nullable`1 cancellationToken)
   at RingCentral.RestClient.Post[T](String endpoint, Object content, Object queryParams, Nullable`1 cancellationToken)
   at RingCentral.Paths.Restapi.Account.Extension.RingOut.Index.Post(MakeRingOutRequest makeRingOutRequest, Nullable`1 cancellationToken)
   at Call_Ringout.Program.call_ringout() in C:\Users\wscheffey\source\repos\Call_Ringout\Call_Ringout\Program.cs:line 55

C:\Program Files\dotnet\dotnet.exe (process 28572) exited with code 0.
To automatically close the console when debugging stops, enable Tools->Options->Debugging->Automatically close the console when debugging stops.
Press any key to close this window . . .

Any help greatly appreciated.