GetUpdatedPackagesWithinDateRange Unhandled Exception

eslClient.SystemService.GetApplicationVersion();

using System;
using System.IO;
using System.Threading;
using Silanis.ESL.SDK;
using System.Diagnostics;

namespace DownloadDocumentsDateRange
{
    class DownloadDocuments
    {
        public static void Main(string[] args)
        {
            //API Identification Strings
            String apiUrl = "https://sandbox.esignlive.com/api";
            String apiKey = "***Redacted***";

             /*
             //Proxy info
             string httpProxyURL = "";
             int httpProxyPort = ;

             //Build Proxy Configuration
             ProxyConfiguration httpProxyConfiguration = ProxyConfigurationBuilder.NewProxyConfiguration()
             .WithHttpHost(httpProxyURL)
             .WithHttpPort(httpProxyPort)
             .Build();

             //Create EslClient
             EslClient eslClient = new EslClient(apiKey, apiUrl, httpProxyConfiguration);
             */

            EslClient eslClient = new EslClient(apiKey, apiUrl);

            //starting point to retrieve completed packages
            int index = 1;

            //Retrieve first 50 completed packages. Packages are returned as a page from eSignLive.
            Page completedPackages = eslClient.PackageService.GetUpdatedPackagesWithinDateRange(DocumentPackageStatus.COMPLETED, new PageRequest(index, 50), DateTime.Today.AddDays(-30), DateTime.Now);
            
            while (index 

Here's the new exception.

Silanis.ESL.SDK.EslException was unhandled
  HResult=-2146233088
  Message=Could not get package list. Exception: Object reference not set to an instance of an object.
  Source=Silanis.ESL
  StackTrace:
       at Silanis.ESL.SDK.Services.PackageService.GetUpdatedPackagesWithinDateRange(DocumentPackageStatus status, PageRequest request, DateTime from, DateTime to)
       at DownloadDocumentsDateRange.DownloadDocuments.Main(String[] args) in ***Redacted***:line 38
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: 
       HResult=-2147467261
       Message=Object reference not set to an instance of an object.
       Source=Silanis.ESL
       StackTrace:
            at Silanis.ESL.SDK.Internal.HttpMethods.GetHttpJson(String apiToken, String path, String acceptType)
            at Silanis.ESL.SDK.RestClient.Get(String path)
            at Silanis.ESL.SDK.Services.PackageService.GetUpdatedPackagesWithinDateRange(DocumentPackageStatus status, PageRequest request, DateTime from, DateTime to)
       InnerException: 


Thanks,

Keith