protected void startEngine() {
GuiPackage gui = GuiPackage.getInstance();
engine = new StandardJMeterEngine();
HashTree testTree = gui.getTreeModel().getTestPlan();
JMeter.convertSubTree(testTree);
DisabledComponentRemover remover = new DisabledComponentRemover(testTree);
testTree.traverse(remover);
testTree.add(testTree.getArray()[0], gui.getMainFrame());
log.debug("test plan before cloning is running version: "
+ ((TestPlan) testTree.getArray()[0]).isRunningVersion());
TreeCloner cloner = new TreeCloner(false);