Error in function 'int main()":

[Eialvare]

Can anyone tell me what this error is? Never saw it before my int main() is there but it keeps saying that. I also get changePassword was not declared in this scope , what does that mean?

In function 'int main()':

#include <iostream>
#include <string>
#include <fstream>
using namespace std;

class UserAccount
{
private:
string userName;
string userPassword;
string userID;
string password;
string oldPassword;
string newPassword;


public:
//constructor
UserAccount ( string userID, string password)
{
userName = userID;
userPassword = password;
}

//login
bool login (string userID,string password)
{

if(userName == userID && userPassword == password)
{
cout << "True" << endl;
}
else {
cout << "False" << endl;
}

} //end login


//ChangePassword
void changePassword ( string oldPassword, string newPassword)
{
if (oldPassword == password)
{
password = newPassword;
}
else {
cout << "wrong" << endl;
}
}
}; //end class

int main ()
{
string userID;
string password;

UserAccount account (userID, password);

cout << "What is your Username?" <<endl;
cin >> userID; //user enter username

cout << "Enter your Password?" <<endl;
cin >> password; //user enter password


if (account.login(userID, password))
changePassword(password, "random_password");


system("pause");
}