强化学习安装gym库后，测试报错

问题遇到的现象和发生背景

强化学习里，安装gym库，运行测试代码，出不了倒立摆的图

用代码块功能插入代码，请勿粘贴截图

import gym

def main():
    env = gym.make('CartPole-v1')
    for i_episode in range(20):
        observation = env.reset()
        for t in range(100):
            env.render()
            print(observation)
            action = env.action_space.sample()
            observation, reward, done, info,_ = env.step(action)
            if done:
                print("Episode finished after {} timesteps".format(t + 1))
                break

if __name__ == "__main__":
    main()

运行结果及报错内容

我想要达到的结果

报错内容复制出来发给我啊