TestDriven.NET 运行错误 Can't find assembly for project 'MyTest200'.

我的IDE 是 vs2005 professional
TestDriven.NET 是 TestDriven.NET-2.16.2217_Personal
在运行测试时总是提示: Can't find assembly for project 'MyTest200'.

代码如下:

/////////// MyClass1.cs //////////////////
using System;
using System.Collections.Generic;
using System.Text;

namespace MyTest200
{
public class MyClass1
{
public void Say()
{
Console.WriteLine("Hello world");
}
}
}

//////////////// MYClass1Test.cs ////////////////////
using System;
using System.Collections.Generic;
using System.Text;
using NUnit.Framework;

namespace MyTest200
{
[TestFixture]
class MYClass1Test
{
[Test]
public void TestSay()
{
MyClass1 ccc = new MyClass1();
ccc.Say();
Assert.AreEqual(1, 1);
}
}
}