WCFErr No overload for method 'NameOfViod' takes x arguments

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C#

WCF

WCFServices

Ok this is my first look and WCF so I am hoping this is a simple fix. This is my code

namespace Bibliotheca.InstallMon 
{
  class InstallMonService : IInstallMon

 public void WriteXMLdata(String p_name, String appv, String date_time, String u_name, String IPAddress, String m_name)
        {

           SomeCode;
           
        }

}

And this is my service

namespace Bibliotheca.InstallMon
{
    [XmlSerializerFormat]

    [ServiceContract]
    public interface IInstallMon
    {

        [OperationContract]

       void WriteXMLdata(String p_name, String appv, String date_time, String u_name, String IPAddress, String m_name);


    }

I then call it from a client app like so.

InstallMonClient client = new InstallMonClient(); 

client.IInstallMon.WriteXMLdata("string", "string", "string", "string", "string", "string");

But unfortunately I get the above error where am I going wrong :(.

Thanks for your help.