Getting an access violation when trying to write

I have been following a tutorial on making a 2d game in C++ when all of a sudden I got an error. It worked in the tutorial with all of the same code so it could be something wrong with my setup but I didn't think it would be.

I am using SFML and here is my main.cpp:

#include <iostream>

#include <SFML/Network.hpp>
#include <SFML/System.hpp>
#include <SFML/Window.hpp>
#include <SFML/Audio.hpp>
#include <SFML/Graphics.hpp>

using namespace sf;

int main()
{
    RenderWindow window(VideoMode(640, 480), "Test Game", Style::Titlebar | Style::Close);
    Event ev;

    // Game Loop
    while (window.isOpen()) {
        // Event Polling
        while (window.pollEvent(ev)) {
            switch (ev.type) {
            case Event::Closed:
                window.close();
                break;

            case Event::KeyPressed:
                if (ev.key.code == Keyboard::Escape)
                    window.close();
                break;
            }
        }

        // Update

        // Render
        window.clear();

        // Draw New Content

        // Tell app that window is done drawing
        window.display();
    }

    return 0;
}

Error:

Exception thrown at 0x00E62B0A in 2D game.exe: 0xC0000005: Access violation writing location 0x00000065.