Turtlesim /spawn service error : rcl node's context is invalid

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I am using ros2 foxy, and I get this error when trying to call the /spawn service from the turtlesim_node :

"terminate called after throwing an instance of 'rclcpp::exceptions::RCLError' what(): could not create client: rcl node's context is invalid, at /tmp/binarydeb/ros-foxy-rcl-1.1.11/src/rcl/node.c:441"

Does anyone has an idea about this error ?

Here is my code :

#include "rclcpp/rclcpp.hpp"
#include "turtlesim/srv/spawn.hpp"

class MyturtleSpawner : public rclcpp::Node {
public:
    MyturtleSpawner() : Node("turtle_spawner"){
    threadV_.push_back(std::thread(std::bind(&MyturtleSpawner::callSpawnClient, this, 1.0, 1.0, 0.0)));
    }
    void callSpawnClient(float, float, float);

private:
    std::vector<std::thread> threadV_;
};
void MyturtleSpawner::callSpawnClient(float x, float y, float theta){
    auto spawnClient = this->create_client<turtlesim::srv::Spawn>("spawn");
    while (!spawnClient->wait_for_service(std::chrono::seconds(1))){
        RCLCPP_INFO(this->get_logger(), "Waiting for the Spawn server to respond ...");
    }

    auto spawnRequest = std::make_shared<turtlesim::srv::Spawn::Request>();
    spawnRequest->x = x;
    spawnRequest->y = y;
    spawnRequest->theta = theta;

    auto future = spawnClient->async_send_request(spawnRequest);

    try{
        auto spawnResponse = future.get();
        RCLCPP_INFO(this->get_logger(), "Turtle Spawned Successfully : %s", spawnResponse->name);
    }
    catch(const std::exception& e){
        RCLCPP_ERROR(this->get_logger(), "Spawn service call failed !");
    } 
}

int main(int argc, char **argv)
{
    rclcpp::init(argc, argv);
    auto node = std::make_shared<MyturtleSpawner>();
    rclcpp::shutdown();
    return 0;
}