Inconsistent accessibility... c#

namespace lambda
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            List<Employee> listEmployees = new List<Employee>()
            {
                new Employee{ID = 101, Name = "Mark"},
                new Employee{ID = 102, Name = "John"},
                new Employee{ID = 103, Name = "Mary"},
            };

            // STEP 2
            Predicate <Employee>  employeePeridicate = new Predicate<Employee>(FindEmployee);
            
            // STEP 3
            Employee employee = listEmployees.Find(emp => FindEmployee(emp));
            MessageBox.Show(employee.ID.ToString() + ", " + employee.Name.ToString());
        }
        // STEP 1
        public  static bool FindEmployee(Employee emp)
        {
            return emp.ID == 102;
       }
    }
}
//
namespace lambda
{
    class Employee
    {
        public int ID { get; set; }
        public string Name { get; set; }
    }
}