Barebone OpenGL project

#include "SFML/System.hpp"
#include <SFML/Window.hpp>
int main()
{
    sf::Window window(sf::VideoMode(800, 600), "OpenGL", sf::Style::Close);//This is the cause of the problem.

    bool running = true;
    while(running){
        sf::Event windowEvent;
        while(window.pollEvent(windowEvent)){
            switch (windowEvent.type)
            {
            case sf::Event::KeyPressed:
            case sf::Event::Closed:
                running = false;
                break;

            default:
                break;
            }
        }

    }

    sf::sleep(sf::seconds(1.f));//This works fine.
    return 0;
}