Hello all the masters in VBA, this is my first post to ask question, but this site is not new to me. I have been absorbing knowledge from all your master posts for very long time. I greatly appreciate all your time and hard work to help people like me who know very very little about VBA code. Without your help, our life will be so painful. I really mean it.

Ok. Here comes with my first question for the form. I "built" a useform for people to fill up some information. The way I designed is that they are able to "merge" data from "sheet2" to a "Master" sheet and then Email the "Master" sheet to via outlook.

However, it is not working the way I wanted. The error message "Copy method of worksheet class failed" keeps coming up... when I clicked "Debug", the following highlighted - Sheets("Master").Copy
I tried many solutions via google around and search into this site. None of them is working. So please help me! I really appreciate your time for this. 
Private Sub EmailCommandButton_Click()
  
'Working in Excel 2000-2013
'For Tips see: http://www.rondebruin.nl/win/winmail/Outlook/tips.htm
    Dim FileExtStr As String
     Dim FileFormatNum As Long
    Dim Sourcewb As Workbook
     Dim Destwb As Workbook
     Dim TempFilePath As String
     Dim TempFileName As String
     Dim OutApp As Object
     Dim OutMail As Object
  
     With Application
         .ScreenUpdating = False
         .EnableEvents = False
     End With
  
     Set Sourcewb = ActiveWorkbook
  
     'Copy the Sheets("Master") to a new workbook
    Sheets("Master").Copy
     Set Destwb = ActiveWorkbook
  
     'Determine the Excel version and file extension/format
    With Destwb
         If Val(Application.Version) < 12 Then
             'You use Excel 97-2003
            FileExtStr = ".xls": FileFormatNum = -4143
         Else
             'You use Excel 2007-2013
            Select Case Sourcewb.FileFormat
             Case 51: FileExtStr = ".xlsx": FileFormatNum = 51
             Case 52:
                 If .HasVBProject Then
                     FileExtStr = ".xlsm": FileFormatNum = 52
                 Else
                     FileExtStr = ".xlsx": FileFormatNum = 51
                 End If
             Case 56: FileExtStr = ".xls": FileFormatNum = 56
             Case Else: FileExtStr = ".xlsb": FileFormatNum = 50
             End Select
         End If
     End With
  
     '    'Change all cells in the worksheet to values if you want
    '    With Destwb.Sheets(1).UsedRange
    '        .Cells.Copy
    '        .Cells.PasteSpecial xlPasteValues
    '        .Cells(1).Select
    '    End With
    '    Application.CutCopyMode = False
 
     'Save the new workbook/Mail it/Delete it
    TempFilePath = Environ$("temp") & "\"
     TempFileName = "Response of " & Sourcewb.Name
    
     ' in case date and time is required
    '& " " & Format(Now, "dd-mmm-yy h-mm-ss")
 
     Set OutApp = CreateObject("Outlook.Application")
     Set OutMail = OutApp.CreateItem(0)
  
     With Destwb
         .SaveAs TempFilePath & TempFileName & FileExtStr, FileFormat:=FileFormatNum
         On Error Resume Next
         With OutMail
             .To = "abc@hotmail.ca"
             .CC = ""
             .BCC = ""
             .Subject = "Pothole Repair Log - Cold Mix Asphalt" & Space(5) & Me.tbDate
             .Body = "Hi there, please find enclosed pothole repair log dated" & vbNewLine & vbNewLine
          
             .Attachments.Add Destwb.FullName
          
             'You can add other files also like this
            '.Attachments.Add ("C:\test.txt")
            .Display  'or use .Display or Send
        End With
         On Error GoTo 0
         .Close savechanges:=False
     End With
  
     'Delete the file you have send
    Kill TempFilePath & TempFileName & FileExtStr
  
     Set OutMail = Nothing
     Set OutApp = Nothing
  
     With Application
         .ScreenUpdating = True
         .EnableEvents = True
     End With
  
End Sub