error: x was not declared in this scope.

#include <iostream>

using namespace std;

int GenerateID()
{
    static int nextID = 0;
    return nextID++;
}

void PrintInformation(Employee EmployeeName)
{
    cout << EmployeeName << "'s ID is: " << EmployeeName.ID << endl;
    cout << EmployeeName << "'s age is: " << EmployeeName.age << endl;
    cout << EmployeeName << "'s wage is: " << EmployeeName.wage << endl;
}

int main()
{

    struct Employee
    {
        int ID;
        int age;
        float wage;
    };

    Employee Dominic;
    Employee Jeffrey;

    Dominic.ID = GenerateID();
    Dominic.age = 22;
    Dominic.wage = 7.10;

    Jeffrey.ID = GenerateID();
    Jeffrey.age = 28;
    Jeffrey.wage = 7.10;

    PrintInformation(Dominic);
    PrintInformation(Jeffrey);

    return 0;
}

/*
C:\CBProjects\Practise\main.cpp|11|error: variable or field 'PrintInformation' declared void|
C:\CBProjects\Practise\main.cpp|11|error: 'Employee' was not declared in this scope|
C:\CBProjects\Practise\main.cpp||In function 'int main()':|
C:\CBProjects\Practise\main.cpp|39|error: 'PrintInformation' was not declared in this scope|
||=== Build finished: 3 errors, 0 warnings (0 minutes, 0 seconds) ===|
*/