Copy workbook and to paste below another workbook MS Excel - excel

Question

First I open a SubWorkbook than copy data from worksheet to update MainWorkbook (paste below):
The problem occur when I try to set variable for worksheet from the workbook I just open. It said: "Subscript out of Range".
What happen to it and how I can fix it, or is it wrong direction that I have to go from another way.
Sub Data_Inbound()
Dim mywb As Workbook
Dim FName As String
Dim wsCopy As Worksheet
Dim wsDest As Worksheet
Dim lCopyLastRow As Long
Dim lDestLastRow As Long
Set mywb = ActiveWorkbook
On Error GoTo errHandler:
FName = Application.GetOpenFilename(filefilter:="Excel Files,*.xlsx*", Title:="Please select an Excel file")
Workbooks.Open FileName:=FName
Set wsCopy = Workbooks(FName).Worksheets(Sheet1)
Set wsDest = Workbooks(mywb).Worksheets(Sheet1)
lCopyLastRow = wsCopy.Cells(wsCopy.Rows.Count, "A").End(xlUp).Row
lDestLastRow = wsDest.Cells(wsDest.Rows.Count, "A").End(xlUp).Offset(1).Row
wsCopy.Range("A2" & lCopyLastRow).Copy _
wsDest.Range("A" & lDestLastRow)
wsDest.Activate
errHandler:
MsgBox "Error " & Err.Number & " (" & Err.Description & ") in procedure Data_Inbound"
Exit Sub
End Sub
I see other guy they have the same question, but they use worksheet name, for me I use a variant variable, but it lead to error:
Other guy:
Set wsCopy = Workbooks("Warranty Template.xlsm").Worksheets("PivotTable")

Answer 1

Copy/Paste From Closed Workbook
The code has run successfully if you see the message. If not, something went wrong, and there is a message in the Immediate window CTRL+G.
The Code
Option Explicit
Sub Data_Inbound()
' Initialize error handling.
Const ProcName As String = "Data_Inbound"
' Do not use error handling while developing the code.
On Error GoTo clearError ' Turn on error trapping.
' Define Destination Workbook.
Dim wb As Workbook
Set wb = ThisWorkbook ' The workbook containing this code.
' Define Source Workbook Name.
Dim srcName As String
srcName = Application.GetOpenFilename(filefilter:="Excel Files,*.xlsx*", _
Title:="Please select an Excel file")
' Open Source Workbook (No variable, but it is the active one).
Workbooks.Open Filename:=srcName
' Define Source Worksheet ('wsSource').
Dim wsSource As Worksheet
Set wsSource = ActiveWorkbook.Worksheets("Sheet1") ' Note the double quotes.
' Define Destination Worksheet ('wsDest')
Dim wsDest As Worksheet
Set wsDest = wb.Worksheets("Sheet1") ' Note the double quotes...
' ... and not: Set wsDest = Workbooks(wb).Worksheets("Sheet1") - wrong!
' Define Source Last (Non-Empty) Row ('srcLastRow').
Dim srcLastRow As Long
srcLastRow = wsSource.Cells(wsSource.Rows.Count, "A").End(xlUp).Row
' Define Destination First (Empty (available)) Row ('destFirstRow').
Dim destFirstRow As Long
destFirstRow = wsDest.Cells(wsDest.Rows.Count, "A").End(xlUp).Offset(1).Row
' Copy from Source to Destination.
wsSource.Range("A2:A" & srcLastRow).Copy wsDest.Range("A" & destFirstRow)
' Note "A2:A" and not: "A2" - wrong!
' Now you wanna close the Source Workbook, but how?
' You can use the 'Parent' property:
wsSource.Parent.Close False ' False means not to save changes.
' If you closed, wsDest is active again so you don't need:
'wsDest.Activate
' Inform user, so you know the code has finished.
MsgBox "Copied data.", vbInformation, "Success"
ProcExit:
Exit Sub
clearError:
Debug.Print "'" & ProcName & "': " & vbLf _
& " " & "Run-time error '" & Err.Number & "':" & vbLf _
& " " & Err.Description
On Error GoTo 0 ' Turn off error trapping.
GoTo ProcExit
End Sub