Member 'EndPoints' cannot be initialized. It is not a field or property.

Hi
Server - AWS Elastic Cache Cluster mode with 2 nodes
Engine - 6.2.5
Client - StackExchange.Redis 2.1.58

This is our code which had been working until recently.

using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

namespace RedisHelper.Client
{
    public class RedisHelperClient
    {

        //  private static readonly Lazy<ConnectionMultiplexer> LazyConnection;

      private static ConfigurationOptions _configurationOptions;
     

        public RedisHelperClient(string argStrEndPoints, string argStrPassword, bool argSsl = false)
        {
            _configurationOptions = new ConfigurationOptions
            {
                EndPoints = { argStrEndPoints },
                Password = argStrPassword,
                AbortOnConnectFail = false,
                KeepAlive = 30,
                ConnectTimeout = 2 * 60 * 1000, // in millisond defulat 5 sec , currently changed to 2 minute
                SyncTimeout = 2 * 60 * 1000, // in millisond defulat 5 sec , currently changed to 2 minute
                Ssl = argSsl

            };
            _configurationOptions.CertificateValidation += (sender, cert, chain, errors) =>
            {
                //Console.WriteLine("errors: " + errors);
                return true;
            };
        }

    

        private static IDatabase RedisCache
        {
            get
            {
                return Connection.GetDatabase();
            }
        }

        private static readonly Lazy<ConnectionMultiplexer> LazyConnection
            = new Lazy<ConnectionMultiplexer>(() => ConnectionMultiplexer.Connect(_configurationOptions));

        public static ConnectionMultiplexer Connection
        {
            get
            {
                return LazyConnection.Value;
            }
        }


        #region Check Keys


      public async Task<bool> IsRedisKeyExistAsync(string argKeyName)
        {
            bool result = false;
            try
            {

                result = await RedisCache.KeyExistsAsync(argKeyName);
            }
            catch (Exception ex)
            {
                throw ex;
            }

            return result;

        }

 }
}

But since we updated our StackExchange.Redis package to version 2.6.48, we are getting this error message :Member 'EndPoints' cannot be initialized. It is not a field or property.
Is there any logic change to the way we connect to redis, or is there is any alternative to this?