🚀 go-pugleaf

Iam a final year computer science student currently working on a
c++ project.  The problem i have is that when i make my program
i get the following message

ld:
Undefined:
_$_4User
collect: /usr/bin/ld returned 1 exit status
*** Error code 1


i have linked the program to all its components e.g User 
the program  will compile except it wont give executable
permission to the final object code.

	When i change mode the program will complete all its tasks 
	till it finishes at which point it gives a segmentation fault

WHAT I  would like to KNOW is what causes the error is it the User constructor
or is it something else
		example of the constructor is provided below

		User::User(String& user_name,String& password)
{
       	
        person= new Personal;  // simple struct 
        if (!Check_password(user_name, password))
                {
                        cout<<" you bombed" << endl;
                        exit(1);
                        //give an error message and abort
                        
                }


          Finances=new Financial(user_name);     
          History=new Tipping_History(user_name);
}
			
		any assistance would be greatly appreciated

				int401a@mdw045.cc.monash.edu.au
				Dragan Vladicic