GetUpdatedPackagesWithinDateRange Unhandled Exception

I'm having some difficulty implementing DownloadDocumentsDateRange posted previously in this forum. When the following code is executed the EslClient.PackageService.GetUpdatedPackagesWithinDateRange function throws an unhandled exception stating that an unexpected character was encountered while parsing value. I assume the string it's trying to parse is the response from eSignLive but I'm at a loss on how to debug it. Is there a way to capture and view this response? Is there documentation on the EslClient class that could shed light on what value the GetUpdatedPackagesWithinDateRange is expecting?

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



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

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

            //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 = completedPackages.TotalElements)
            {
                foreach (DocumentPackage package in completedPackages)
                {
                    //for each completed package, get the package id to download signed documents.
                    Debug.WriteLine("Downloading package: " + package.Id + "...");
                    byte[] zipContent = eslClient.DownloadZippedDocuments(package.Id);
                    File.WriteAllBytes("C:\\" + package.Id.ToString() + ".zip", zipContent);
                    index++;
                    Thread.Sleep(1000);
                }
                //Retrieve next 50 packages
                completedPackages = eslClient.PackageService.GetUpdatedPackagesWithinDateRange(DocumentPackageStatus.COMPLETED, new PageRequest(index, 50), DateTime.Today.AddDays(-30), DateTime.Now);
            }
            Debug.WriteLine("Downloaded All File!");
        }
    }
}

Here's the full stack trace.

Silanis.ESL.SDK.EslException was unhandled
  HResult=-2146233088
  Message=Could not get package list. Exception: Unexpected character encountered while parsing value: . Path '', line 0, position 0.
  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 39
       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=-2146233088
       LineNumber=0
       LinePosition=0
       Message=Unexpected character encountered while parsing value: . Path '', line 0, position 0.
       Path=""
       Source=Newtonsoft.Json
       StackTrace:
            at Newtonsoft.Json.JsonTextReader.ParseValue()
            at Newtonsoft.Json.JsonTextReader.ReadInternal()
            at Newtonsoft.Json.JsonTextReader.Read()
            at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ReadForType(JsonReader reader, JsonContract contract, Boolean hasConverter)
            at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
            at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
            at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings)
            at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings)
            at Silanis.ESL.SDK.EslServerException..ctor(String message, String errorDetails, WebException cause)
            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 for taking a look!