老师，按照您说的授课流程一步步写的为什么报错TypeError: main() missing 1 required positional argument: ‘self’。 请老师帮我看看哪里有问题？

具体报错信息：
E:\Python3.7.1\python.exe F:/test_project/case/first_case.py
Traceback (most recent call last):
File “F:/test_project/case/first_case.py”, line 5, in
class FirstCase(object):
File “F:/test_project/case/first_case.py”, line 52, in FirstCase
main()
TypeError: main() missing 1 required positional argument: ‘self’

Process finished with exit code 1

代码详情
#PO模式：case、页面、数据全部分离开来
#下面是一条条的用例，case，只管输入
from selenium import webdriver
from business.register_business import RegisterBusiness
class FirstCase(object):
def init(self):
driver = webdriver.Chrome()
driver.get(‘http://www.5itest.cn/register’)
self.login = RegisterBusiness(driver)

#判断邮箱检验是否正确
def test_login_email_error(self):
    email_error = self.login.login_email_error('14','user111','111111','test1')
    if email_error == True:
        print('注册成功，此条case失败')
    #通过assert  判断是否是  error

# 判断用户名检验是否正确
def test_login_username_error(self):
    username_error = self.login.login_name_error('14@qq.com', '@#$', '111111', 'test1')
    if username_error == True:
        print('注册成功，此条case失败')

# 判断密码检验是否正确
def test_login_password_error(self):
    password_error = self.login.login_password_error('14@qq.com', 'user111', '1', 'test1')
    if password_error == True:
        print('注册成功，此条case失败')

# 判断验证码检验是否正确
def test_login_code_error(self):
    code_error = self.login.login_code_error('14@qq.com', 'user111', '1', 'test1')
    if code_error == True:
        print('注册成功，此条case失败')

# 是否注册成功，true是成功
def test_login_success(self):
    success = self.login.user_base('14@qq.com','user111','111111','test1')
    if self.login.register_sucess()== True:
        print("注册成功")

#把整体的结构分解出来，再一步步填入
def main(self):
    first = FirstCase()
    first.test_login_email_error()
    first.test_login_code_error()
    first.test_login_password_error()
    first.test_login_username_error()
    first.test_login_success()

if __name__ == '__main__':
    main()