title: Cannot use System.Object type within WCF WebService
body: <p>I'm trying to create a method using the object type within my WCF WebService, but I get the following error :</p>
  
  <p><img src="https://i.stack.imgur.com/gclQY.jpg" alt="Error"></p>
  
  <p><strong>Interface :</strong></p>
  
  <pre><code>    [ServiceContract]
  public interface IService1
  {
  
      [OperationContract]
     object GetTwoX(object yo);
  
  }
  </code></pre>
  
  <p><strong>Class :</strong></p>
  
  <pre><code>public class Service1 : IService1
  {
      static public Dictionary&lt;string, List&lt;OPUSInfo&gt;&gt; cache;
  
      public object GetTwoX(object yo)
      {
          return yo;
      }
  
  }
  </code></pre>
  
  <p>Does somebody know how to pass Object type in ?</p>