[Vala] Builder member variable of a class problem

[John - <arenal85 hotmail com>]

I have this code :

    public class TestWindow : GLib.Object
    {
        private Builder builder;

        public TestWindow ()
        {
            this.builder = new Builder();
            
            try
            {
                this.builder.add_from_file ("test.ui");
            }
            catch (Error exc) 
            {
                
            }
            
            this.builder.connect_signals (this);
            
        }
        
        [CCode (instance_pos = -1)]
        public void on_testButton_activate(Button sender)
        {
           Window window = (Window) this.builder.get_object("main");
        }

    }
    }

I get : 
"The application was terminated by a signal: SIGSEGV" when program enters into activate signal.

I try to do :
stdout.printf(this.builder.ref_count.to_string());

But also I get the same error, I think Builder object is null ...

                                          
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