download a file from sharepoint online using caml and by filename

Hi,

Here is my code and i am getting exception "The property or field has not been initialized. It has not been requested or the request has not been executed. It may need to be explicitly requested. - "

in the this line of the code:   var list = context.Web.Lists.GetByTitle(library);

Below is the whole code:-

public void Main()
        {
            var site = (string)Dts.Variables["$Package::SiteUrl"].Value;
            var library = (string)Dts.Variables["$Package::Library"].Value;
            var directory = (string)Dts.Variables["$Package::fileDestination"].Value;
            var ErrorFile = (string)Dts.Variables["$Package::ErrorLog"].Value;
            var filename_1 = (string)Dts.Variables["User::fileName_1"].Value;

            try
            {
                CamlQuery camlQuery = new CamlQuery();
                camlQuery.ViewXml =

         @"<View>

               <Query>

                  <Where><Eq><FieldRef Name='FileLeafRef' /><Value Type='File'>" + filename_1 + @"</Value></Eq></Where>

               </Query>

                <ViewFields><FieldRef Name='FileRef' /><FieldRef Name='FileLeafRef' /></ViewFields>

         </View>";
                 ClientContext context = new ClientContext(site);
                var securePassword = new SecureString();
                var password = "1234abc";
              
                foreach (char c in password.ToCharArray()) securePassword.AppendChar(c);
                context.Credentials = new SharePointOnlineCredentials(@"johnd@xyz.com", securePassword);
                var list = context.Web.Lists.GetByTitle(library);
                ListItemCollection listItems = list.GetItems(camlQuery);
                
                context.Load(listItems);

                context.ExecuteQuery();

                var listItem = listItems.FirstOrDefault();

}

Pls guide me through this.