Try to take username and password from below code snipet in your project and login and hope this will work.
@Override
@Bean
public UserDetailsService userDetailsService() {
List<UserDetails> users= new ArrayList<UserDetails>();
users.add(User.withDefaultPasswordEncoder().username("admin").password("admin").roles("USER","ADMIN").build());
users.add(User.withDefaultPasswordEncoder().username("spring").password("spring").roles("USER").build());
return new UserDetailsManager(users);
}