I have 4 errors i have been trying to solve them it's been a week

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#pragma once
#include <iostream>
#include <vector>
#include <sstream>
#include <string>
#include "Client.h"
#include "Employee.h"
#include "Admin.h"
using namespace std;

class Parser {
public:
    static vector<string> split(string line) {
        vector<string> parts;
        istringstream ss(line);
        string part;
        while (getline(ss, part, ',')) {
            parts.push_back(part);
        }
        return parts;
    }

    static Client parseToClient(string line) {
        vector<string> parts = Parser::split(line);
        Client client;
        if (parts.size() == 5) {
            client.setID(stoi(parts[0]));
            client.setName(parts[1]);
            client.setAge(stoi(parts[2]));
            client.setPassword(parts[3]);
            client.setBalance(stod(parts[4]));
        }
        return client;
    }

    static Employee parseToEmployee(string line) {
        vector<string> parts = Parser::split(line);
        Employee employee;
        if (parts.size() == 5) {
            employee.setID(stoi(parts[0]));
            employee.setName(parts[1]);
            employee.setAge(stoi(parts[2]));
            employee.setPassword(parts[3]);
            employee.setSalary(stod(parts[4]));
        }
        return employee;
    }

    static Admin parseToAdmin(string line) {
        vector<string> parts = Parser::split(line);
        Admin admin;
        if (parts.size() == 5) {
            admin.setID(stoi(parts[0]));
            admin.setName(parts[1]);
            admin.setAge(stoi(parts[2]));
            admin.setPassword(parts[3]);
            admin.setSalary(stod(parts[4]));
        }
        return admin;
    }
};