code: public BehaviorTree<E> parse (String string, E object) {
  		btReader.parse(string);
  		return createBehaviorTree(btReader.root, object);
  	}
docs: Parses the given string.
  @param string the string to parse
  @param object the blackboard object. It can be {@code null}.
  @return the behavior tree
  @throws SerializationException if the string cannot be successfully parsed.