Wt

The following problem make me so confused.

• Firstly please look at the file "TestControl.cpp",it would be correctly run.
  TestControl::TestControl(TestSuitTree *arg_p_tree)
  : app_(WApplication::instance())
  {
  this->setStyleClass("testcontrol");
  treeName_ = new WText("No test suit will be started",this);
  new WBreak(this);
  startButton_ = new WPushButton("start",this);
  //stopButton_ = new WPushButton("stop",this);

    testSuitTree_ = arg_p_tree;
    treeEventConnection_ = 
      testSuitTree_->treeEvent().connect(SLOT(this,
                         TestControl::showTreeName));
  
    app_->enableUpdates();  
  }
  

• Secondly make the following code out, it got a fault
  stopButton_ = new WPushButton("stop",this);

• Thirdly I tried some other method instead of this code , it could be run normally.
  new WPushButton("stop",this);

And now I am confused, and don't know the reason about it!

I don't think there is something wrong in this code.

Is there other wrong?

I have uploaded the whole project.

Someone could help me?

Thank you!