Program: 32887
Project: 32887
Buggy source:
protected void showExportDialog(){
  final Preferences prefs=Gdx.app.getPreferences("String_Node_Str" + game.screenMain.getcurrentProject());
  final TextField textDirectory=new TextField(prefs.getString("String_Node_Str"),game.skin);
  Dialog dlg=new Dialog("String_Node_Str",game.skin){
    @Override protected void result(    Object object){
      if ((Boolean)object == true) {
        if (textDirectory.getText().isEmpty() == true) {
          game.showNotice("String_Node_Str","String_Node_Str",game.screenMain.stage);
          return;
        }
        FileHandle targetDirectory=new FileHandle(textDirectory.getText());
        if (targetDirectory.exists() == false) {
          game.showNotice("String_Node_Str","String_Node_Str",game.screenMain.stage);
          return;
        }
        FileHandle projectFolder=Gdx.files.local("String_Node_Str").child(game.screenMain.getcurrentProject());
        for (        FileHandle file : projectFolder.list()) {
          if (file.name().startsWith("String_Node_Str") || (file.extension() == "String_Node_Str")) {
            Gdx.app.log("String_Node_Str","String_Node_Str" + file.name() + "String_Node_Str");
            FileHandle target=targetDirectory.child(file.name());
            file.copyTo(target);
          }
        }
        game.showNotice("String_Node_Str","String_Node_Str",game.screenMain.stage);
      }
    }
  }
;
  dlg.pad(20);
  Table table=dlg.getContentTable();
  table.padTop(20);
  table.add("String_Node_Str");
  table.add(textDirectory).width(320);
  TextButton buttonChoose=new TextButton("String_Node_Str",game.skin);
  buttonChoose.addListener(new ChangeListener(){
    @Override public void changed(    ChangeEvent event,    Actor actor){
      JFileChooser chooser=new JFileChooser();
      chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
      int ret=chooser.showOpenDialog(null);
      if (ret == JFileChooser.APPROVE_OPTION) {
        File f=chooser.getSelectedFile();
        textDirectory.setText(f.getAbsolutePath());
        prefs.putString("String_Node_Str",f.getAbsolutePath());
        prefs.flush();
      }
    }
  }
);
  table.add(buttonChoose);
  table.row();
  table.padBottom(20);
  dlg.button("String_Node_Str",true);
  dlg.button("String_Node_Str",false);
  dlg.key(com.badlogic.gdx.Input.Keys.ENTER,true);
  dlg.key(com.badlogic.gdx.Input.Keys.ESCAPE,false);
  dlg.show(getStage());
}

Fixed version (ground truth):
protected void showExportDialog(){
  final Preferences prefs=Gdx.app.getPreferences("String_Node_Str" + game.screenMain.getcurrentProject());
  final TextField textDirectory=new TextField(prefs.getString("String_Node_Str"),game.skin);
  Dialog dlg=new Dialog("String_Node_Str",game.skin){
    @Override protected void result(    Object object){
      if ((Boolean)object == true) {
        if (textDirectory.getText().isEmpty() == true) {
          game.showNotice("String_Node_Str","String_Node_Str",game.screenMain.stage);
          return;
        }
        FileHandle targetDirectory=new FileHandle(textDirectory.getText());
        if (targetDirectory.exists() == false) {
          game.showNotice("String_Node_Str","String_Node_Str",game.screenMain.stage);
          return;
        }
        FileHandle projectFolder=Gdx.files.local("String_Node_Str").child(game.screenMain.getcurrentProject());
        for (        FileHandle file : projectFolder.list()) {
          if (file.name().startsWith("String_Node_Str") || (file.extension() == "String_Node_Str")) {
            Gdx.app.log("String_Node_Str","String_Node_Str" + file.name() + "String_Node_Str");
            FileHandle target=targetDirectory.child(file.name());
            file.copyTo(target);
          }
        }
        game.showNotice("String_Node_Str","String_Node_Str",game.screenMain.stage);
      }
    }
  }
;
  dlg.pad(20);
  Table table=dlg.getContentTable();
  table.padTop(20);
  table.add("String_Node_Str");
  table.add(textDirectory).width(320);
  TextButton buttonChoose=new TextButton("String_Node_Str",game.skin);
  buttonChoose.addListener(new ChangeListener(){
    @Override public void changed(    ChangeEvent event,    Actor actor){
      Frame frame=new Frame();
      frame.setUndecorated(true);
      frame.setOpacity(0);
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
      frame.toFront();
      frame.setVisible(false);
      frame.dispose();
      JFileChooser chooser=new JFileChooser();
      chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
      int ret=chooser.showOpenDialog(null);
      if (ret == JFileChooser.APPROVE_OPTION) {
        File f=chooser.getSelectedFile();
        textDirectory.setText(f.getAbsolutePath());
        prefs.putString("String_Node_Str",f.getAbsolutePath());
        prefs.flush();
      }
    }
  }
);
  table.add(buttonChoose);
  table.row();
  table.padBottom(20);
  dlg.button("String_Node_Str",true);
  dlg.button("String_Node_Str",false);
  dlg.key(com.badlogic.gdx.Input.Keys.ENTER,true);
  dlg.key(com.badlogic.gdx.Input.Keys.ESCAPE,false);
  dlg.show(getStage());
}