I cant inherit form my parent class - vb.net

Question

I'm having a problem that I cant figure out, I'm trying to code a payroll system with vb.net 2013, I must use a console application.
I'm using classes to calculate the salary depending on the amount of weeks that the employee's worked, but the problem is that I cannot inherit from my parent class, I keep on getting this error and i don't know how to fix it.
Error 2 Class 'Employee_Payment_System.Employee' has no accessible 'Sub New' and cannot be inherited.
Whenever i try to add a 'sub new' I get this
Error 3 'Public Sub New()' has multiple definitions with identical signatures.
Here is my code so far
Public Class Employee
#Region "Private Declarations"
Private EMP_FullName As String
Private EMP_LastName As String
Private EMP_Salary As Double
Private EMP_Number As Integer
Private EMP_Address As String
#End Region
'The values are obtained from the public properties coded below
Private Sub New()
EMP_FullName = ""
EMP_LastName = ""
EMP_Salary = 0.0
EMP_Address = ""
End Sub
Private Sub New(ByVal FullName As String, ByVal LastName As String, ByVal Address As String, ByVal Salary As Double, ByVal Number As Integer)
EMP_FullName = FullName
EMP_LastName = LastName
EMP_Address = Address
EMP_Number = Number
EMP_Salary = Salary
End Sub
' the properties gets their values from the console
Public Property FullName() As String
Get
Return EMP_FullName
End Get
Set(value As String)
EMP_FullName = value
End Set
End Property
Public Property LastName() As String
Get
Return EMP_LastName
End Get
Set(value As String)
EMP_LastName = value
End Set
End Property
Public Property Address() As String
Get
Return EMP_Address
End Get
Set(value As String)
EMP_Address = value
End Set
End Property
Public Property Salary() As Double
Get
Return EMP_Salary
End Get
Set(value As Double)
EMP_Salary = value
End Set
End Property
Public Property Number() As Integer
Get
Return EMP_Number
End Get
Set(value As Integer)
EMP_Number = value
End Set
End Property
Public Overridable Function Payment() As Double
Return EMP_Salary
End Function
End Class
Public Class WeeklySalary : Inherits Employee
'The main problem "Error 2 Class 'Employee_Payment_System.Employee' has no accessible 'Sub New' and cannot be inherited." generates here
Sub New()' I get my second error "Error 3 'Public Sub New()' has multiple definitions with identical signatures. " here
End Sub
Private NumberOfWeeks As Integer
Private Sub New() 'The second Error is related to this sub
NumberOfWeeks = 0
End Sub
Public Sub New()
NumberOfWeeks = Number
End Sub
Public Property Number_Of_Weeks() As Integer 'This is the number of weeks worked
Get
Return NumberOfWeeks
End Get
Set(value As Integer)
NumberOfWeeks = value
End Set
End Property
Public Overrides Function Payment() As Double
Return NumberOfWeeks * Salary 'Calculates Weekly salary here
End Function
End Class
I still have to code one more Class for monthly payments, and I still need to code the module for the console interface but I need my classes to work before I can start the module (For testing purposes).

Answer 1

Okay I have managed to fix it, I have changed my private constructors to public and it worked thank you

Answer 2

As jonrsharpe says: Why are you making your constructors (Sub New) private? When adding a Public Sub New without parameters it clashes with Private Sub New(). You cannot have to methods with the same name and foot print.
But what are you trying to achieve by inheriting from Employee? If you are trying to do some EmployeeWorkRecord class it should probably aggregate Employee and work records and not inherit from it.

Answer 3

I'm not writing this as a criticism, just as a general pointer about inheritance.
The idea of inheritance is that child classes are the same kind of object as the parent class, but with extra functionality.
To have a real world comparison, Somebody's wages aren't the same as the somebody.
However you could have for example a class Human. A child class of that could be an employee while another child class could be a customer. Each with their own properties.
An employee could have a StartOfEmployment property while a customer could have for example a LoyaltyCardPoints property, and they could both have ContactAddress and Gender.
Anyway. To the answer - or one possible one at any rate
I suspect that you're looking at inheritance the wrong way round. The employee could possibly inherit the WeeklySalary class, while a class of Manager could possibly inherit from a MonthlySalary Class. But you'd probably be better setting up some sort of datatable using employee numbers as a key. if you do it the way youre doing at the moment, you'd have a lot of either duplicated or unused data in your program.
The naming of parent and child classes sometimes is counter intuitive as we often think as children as being smaller than the parents, but in programming, the child is the same as the parent but with extra funtionality.