B4J Question User Defined Exception

Sub Process_Globals
    Private UserError As ExceptionEx
End Sub

Sub AppStart (Args() As String)

    Dim triggerError As Boolean = True
   
    Try
        If triggerError Then
            UserError.Initialize("Error Triggered")
            UserError.Throw  
        End If
    Catch
        Log(UserError.Message)
        Log(LastException)
    End Try

End Sub