Question about setPreTickFunction

[robologics1]

I am trying to add constant check function to my structure via setPreTickFunction() . I want the node whose turn it is to check the condition just before it runs. Should I write the following code inside a while loop, or is it enough to set the pretickfunction just once?
Additionally, in the code below, it prints the ros_info and the second cerr message, but it does not print the cerr message inside the lambda function, so I think I am making a mistake somewhere in the pretickfunction. Thank you.
Function
`void Test::setupActionNodesPreTick(BT::Tree& tree_)
{
tree_.applyVisitor([&](BT::TreeNode* node) -> void {

    if (node->type() == BT::NodeType::ACTION && node->config().action_ptr->conditions != "null") 
    {
      
        ROS_INFO("it arrives here %s ", node->config().action_ptr->conditions.c_str());
        
        node->setPreTickFunction([this, node](BT::TreeNode& action_node) -> BT::NodeStatus {
        std::cerr << "Processing node in : " << node->registrationName().c_str() << std::endl;
        if (!this->checkConditions(node->config().action_ptr->conditions)) {
        return BT::NodeStatus::SKIPPED;
        }
        return BT::NodeStatus::IDLE;
        });

        std::cerr << "Processing node in : " << node->registrationName().c_str() << std::endl;
      
    }
});

}`