Problem with getting AuditTrail using RestSharp

Hello,

I want to get the audit trail document. Below is my example code, the response returns empty content with "NoContent" status code.

var client = new RestClient( apiAccessPoint );
var request = new RestRequest( string.Format( "/api/rest/v5/agreements/{0}/auditTrail", agreementId ), Method.GET );
request.AddHeader( "Access-Token", accessToken );
var result = client.Execute( request );

What is wrong in my code?

In similar way I trying to get the signed document in that case all works well.