VBA Opening workbook error - vba

Question

I have a VB form in Access 2010, that opens a file dialog box to make a excel selection. I send the file path as string to my variable: directory (directory = strPath) to open the workbook and copy its contents to my current workbook. Which works fine if you intend to use the tool once. It's when you import one file, then another that's in the same directory the error occurs.
Non-working Example:
Selected C:\Desktop\File1.xls, Import
Selected C:\Desktop\File2.xls, Import
Error:
Run-time error '1004':
A document with the name 'Tool.xlsm' is already open. You cannot open two documents with the same name, even if the documents are in different folders. To open the second document, either close the document that's currently open, or rename one of the documents.
Working Example (Separate Folders):
Selected C:\Desktop\File1.xls, Import
Selected C:\Desktop\TestFolder\File2.xls, Import
Public Sub CommandButton1_Click()
Dim intChoice As Integer
Dim strPath As String
Application.EnableCancelKey = xlDisabled
'only allow the user to select one file
Application.FileDialog(msoFileDialogOpen).AllowMultiSelect = False
'make the file dialog visible to the user
intChoice = Application.FileDialog(msoFileDialogOpen).Show
'determine what choice the user made
If intChoice <> 0 Then
'get the file path selected by the user
strPath = Application.FileDialog( _
msoFileDialogOpen).SelectedItems(1)
'print the file path to sheet 1
TextBox1 = strPath
End If
End Sub
Public Sub CommandButton2_Click()
Dim directory As String, FileName As String, sheet As Worksheet, total As Integer
Application.ScreenUpdating = False
Application.DisplayAlerts = False
directory = strPath
FileName = Dir(directory & "*.xls")
Do While FileName <> ""
Workbooks.Open (directory & FileName)
For Each sheet In Workbooks(FileName).Worksheets
total = Workbooks("Tool.xlsm").Worksheets.Count
Workbooks(FileName).Worksheets(sheet.name).Copy _
after:=Workbooks("Tool.xlsm").Worksheets(total)
Next sheet
Workbooks(FileName).Close
FileName = Dir()
Loop
Application.ScreenUpdating = True
Application.DisplayAlerts = True
Application.EnableCancelKey = xlDisabled
Application.DisplayAlerts = False
End Sub
In DEBUG mode it doesn't like
Workbooks.Open (directory & FileName)
Any suggestions on a way to eliminate this error?

Answer 1

First, between directory and FileName, i assume there is a "\".
secondly, simply check if the workbook is already opened:
dim wb as workbook
err.clear
on error resume next
set wb = Workbooks (FileName) 'assuming the "\" is not in FileName
if err<>0 or Wb is nothing then 'either one works , you dont need to test both
err.clear
set wb= Workbooks.Open (directory & FileName)
end if
on error goto 0
if you don't use application.enableevents=false, your opened Wb will trigger its workbook_open events !

Answer 2

I wanted to post the working code, maybe it will help someone in the future. Thanks again to those who left comments.
This code will open a file dialog, allow the user to select 1 excel file then copy all sheets from the selected file into the current workbook.
Public Sub CommandButton1_Click()
Dim intChoice As Integer
Application.EnableCancelKey = xlDisabled
'only allow the user to select one file
Application.FileDialog(msoFileDialogOpen).AllowMultiSelect = False
'make the file dialog visible to the user
intChoice = Application.FileDialog(msoFileDialogOpen).Show
'determine what choice the user made
If intChoice <> 0 Then
'get the file path selected by the user
strPath = Application.FileDialog( _
msoFileDialogOpen).SelectedItems(1)
'print the file path to textbox1
TextBox1 = strPath
End If
End Sub
Public Sub CommandButton2_Click()
Dim directory As String, FileName As String, sheet As Worksheet, total As Integer
Dim wb As Workbook
Application.ScreenUpdating = False
Application.DisplayAlerts = False
Err.Clear
On Error Resume Next
Set wb = Workbooks(FileName) 'assuming the "\" is not in FileName
If Err <> 0 Or wb Is Nothing Then 'either one works , you dont need to test both
Err.Clear
Set wb = Workbooks.Open(directory & TextBox1)
End If
On Error GoTo 0
FileName = Dir(directory & TextBox1)
Do While FileName <> ""
Workbooks.Open (directory & TextBox1)
For Each sheet In Workbooks(FileName).Worksheets
total = Workbooks("NAMEOFYOURWORKBOOK.xlsm").Worksheets.Count
Workbooks(FileName).Worksheets(sheet.name).Copy _
after:=Workbooks("NAMEOFYOURWORKBOOK.xlsm").Worksheets(total)
Next sheet
Workbooks(FileName).Close
FileName = Dir()
Loop
Application.ScreenUpdating = True
Application.DisplayAlerts = True
Application.EnableCancelKey = xlDisabled
Application.DisplayAlerts = False
End Sub