Why do I get an InvalidOperationsException error? - vb.net

Question

Here's the deal. I tried using classes instead of the usual modules(in an attempt to try a different approach[aside from what I know that is] to OOP). So I used classes and in a simple showing and hiding of forms, I got an InvalidOperationsException error. Weirded out, I removed the OOP parts and just tried calling the other form directly on the form itself and still got the same error.
Here's the error I get:
An error occurred creating the form. See Exception.InnerException for details. The error is: The form referred to itself during construction from a default instance, which led to infinite recursion. Within the Form's constructor refer to the form using 'Me.'
Here's the code:
Private Sub btnNewSales_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnNewOrder.Click
'This ought to have opened the new form via a method in the class
'order.NewOrder()
frmNewOrder.Show()
Me.Hide()
End Sub
either way, I get the same error.
Tried using modules instead. Here's the code:
Public Sub ShowForm(ByVal frmName As String)
If frmName = "Order" Then
frmOrders.Show()
ElseIf frmName = "AddOrder" Then
frmAddOrder.Show()
End If
End Sub
Now so far (in all my programming experience) this ought to work just fine, but it still returns the same error..
Update!
Tried removing all OOP aspects in form calling and left a module to simply show or hide some controls in one form.
Here's the code in the module:
Public Sub DesignSelect(ByVal design As String)
If design = "Basic" Then
frmAddOrder.lblD3.Hide()
frmAddOrder.cmbD3Color.Hide()
frmAddOrder.cmbD3Type.Hide()
frmAddOrder.lblD4.Hide()
frmAddOrder.cmbD4Color.Hide()
frmAddOrder.cmbD4Type.Hide()
Else
End If
End Sub
Now correct me if I'm wrong, but I do believe nothing is wrong with it right?
Now here's the code of the form where the module was used:
Dim selectedDesign As String = ""
Private Sub frmSalesTrans_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
Private Sub frmSalesTrans_FormClosing(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Me.FormClosing
'ShowForm("Order")
frmOrders.Show()
End Sub
Private Sub rdbBasic_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles rdbBasic.CheckedChanged
selectedDesign = "Basic"
DesignSelect(selectedDesign)
End Sub
And here's the code of the form that calls the form above:
Private Sub frmSales_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
Private Sub btnNewSales_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnNewOrder.Click
Me.Hide()
frmAddOrder.Show()
End Sub
Now it just boggles me why I get this error.. If I removed all OOP (including the subprocedure DesignSelect), it works fine. Kindly enlighten me on this...