链接错误LNK2001(Linker error LNK2001)

当我试图创建一个对象我在Visual Studio中得到了LNK2001错误，它与构造我想既然改变构造改变错误的问题。

Customer bob("Bob", "25 Bob Lane", "01bob82", "M", "bob/bob/bob");

此行给出了这样的错误：

Error   1   error LNK2001: unresolved external symbol "public: __thiscall
Customer::Customer(class std::basic_string<char,struct std::char_traits<char>,class
std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class
std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class 
std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class
std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class
std::allocator<char> >)" (??0Customer@@QAE@V?$basic_string@DU?$char_traits@D@std@@V?
$allocator@D@2@@std@@0000@Z)    D:\Dropbox\Work\C++\C++ Assignment\C++ 
Assignment\driver.obj

客户类，它包含了构造函数：

#pragma once
#include "l_list.h"
#include "Account.h"
#include <string>

using namespace std;

class Customer
{
private:
    l_list<Account> accounts;
    string name;
    string address;
    string telNo;
    string sex;
    string dob;

public:
    Customer(string name, string address, string telNo, string sex, string dob)
    {
        Customer::name = name;
        Customer::address = address;
        Customer::telNo = telNo;
        Customer::sex = sex;
        Customer::dob = dob;
    }

    void createAccount()
    {
        cout << "What type of account?";

    }

};