[MonoDevelop] can't execute class library in mono develop

[amged]

I created a C# class library using visual studio and it works well in visual
studio, and when trying to execute it in mono develop I get error 
the library code:

    namespace ClassLibrary2
{
    public class Class2
    {

      public  static void dosomething() {Console.WriteLine("dfss"); }
    }
}

the code in mono develop:

namespace cons
{
    class MainClass
    {
        public static void Main (string[] args)
        {

            ClassLibrary2.Class2.dosomething();
        }
    }
}
the error 
http://mono.1490590.n4.nabble.com/file/n4370420/g9wIt.png 

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