FitNesse tesing framework

On executing a simple Fitnesse test, I am getting the error :

Could not complete testing: java.lang.Exception: FitClient external process terminated before a connection could be established

I did following steps regarding fit framework.

1) Installed following tools on my machine.
• Java VM 6 to support FitNesse. Download and install from
http://java.sun.com.
• Microsoft .NET 3.5 (at least) Framework to support FitSharp, the .NET
test runner for FitNesse. Download and install from
http://msdn.microsoft.com/netframework.
• FitNesse server. Download the latest release from
http://www.fitnesse.org/FrontPage.FitNesseDevelopment.DownLoad.
The file you should look for is fitnesse.jar. FitNesse.org occasionally
goes down for maintenance. If it is not accessible when you try to
download the latest release, go to the alternative download site
http://www.fitnesse.info/download.
• FitSharp binaries for .NET 3.5. Download the latest release from
http://github.com/jediwhale/fitsharp/tree/master/binary/.
2) Setting up FitNesse

• Start FitNesse by executing java -jar fitnesse.jar from the main FitNesse
folder (double-click)


3) http://localhost:80


4) Create .net project (Console Application) project name is HelloWorld
5) Create new class OurFirstTest and add following code.
namespace HelloWorld
{
public class OurFirstTest : fit.ColumnFixture
{
public string string1;
public string string2;
public string Concatenate()
{
return string1 + " " + string2;
}
}
}
6) Add a reference to fit.dll and fitsharp.dll (in the dotnet2 FitNesse folder)
7) Create dll of that class.
8) Open http://localhost:80/HelloWorld
9) Pest following code
!define COMMAND_PATTERN {%m -r fitnesse.fitserver.FitServer,dotnet2\fit.dll
%p}
!define TEST_RUNNER {dotnet2\Runner.exe}
!path D:\work\fitnesse\HelloWorld\bin\Release\HelloWorld.dll

!|HelloWorld.OurFirstTest|
|string1|string2|Concatenate?|
|Hello|World|Hello World|


10) Click on Save

11) Click on Test(I am gating following error)
Could not complete testing: java.lang.Exception: FitClient external process terminated before a connection could be established