Pygame.error: video system not initialized

import random
from superwires import games
games.init(screen_width=1366, screen_height=768, fps=50)
 
class Asteroid(games.Sprite):
    SMALL=1
    MEDIUM=2
    LARGE=3
    images = {SMALL:games.load_image("small.png"),
              MEDIUM:games.load_image("medi.png"),
              LARGE:games.load_image("big.png")}
    SPEED=2
    def __init__(self, x, y, size):
        super(Asteroid, self).__init__(
            image=Asteroid.images[size],
            x=x , y=y ,
            dx = random.choice([1, -1])*Asteroid.SPEED*random.random()/size,
            dy = random.choice([1, -1])*Asteroid.SPEED*random.random()/size)
        self.size=size
    def update(self):
        if self.top>games.screen.height:
            self.bottom=0
        if self.bottom<0:
            self.top=games.screen.height
        if self.left>games.screen.width:
            self.right=0
        if self.right<0:
            self.left=games.screen.width
def main():
    space_image=games.load_image("space.png", transparent = 0)
    games.screen.background=space_image
 
    for i in range(8):
        x=random.randrange(games.screen.width)
        y=random.randrange(games.screen.height)
        size = random.choice([Asteroid.SMALL, Asteroid.MEDIUM, Asteroid.LARGE])
        new_asteroid = Asteroid(x = x , y=y, size = size)
        games.screen.add(new_asteroid)
        games.screen.mainloop()
main()