Error code 76 with VBA, not in every moment - excel

Question

I'm having an issue with my code:
Sub lalalala ()
Dim s5 As Worksheet
Set s5 = ThisWorkbook.Sheets("Test")
Dim DesktopPath As String
Dim DesktopPathMAIN As String
Dim DesktopPathSUB As String
Dim file As String
Dim sfile As String
Dim sDFolder As String
Dim oFSO As Object
Set oFSO = CreateObject("Scripting.FileSystemObject")
DesktopPath = Environ("USERPROFILE") & "\Desktop\"
DesktopPathMAIN = DesktopPath & "THE FINAL TEST"
If Dir(DesktopPathMAIN, vbDirectory) = "" Then
Shell ("cmd /c mkdir """ & DesktopPathMAIN & """")
End If
lastrow = s5.Range("B" & s5.Rows.Count).End(xlUp).Row
Set rng = s5.Range("B1:B" & lastrow)
For Each c In rng
If Dir(DesktopPathMAIN & "\" & c.Offset(, 5).Value, vbDirectory) = "" Then
Shell ("cmd /c mkdir """ & DesktopPathMAIN & "\" & c.Offset(, 5).Value & """")
End If
Next c
lastrow = s5.Range("G" & s5.Rows.Count).End(xlUp).Row
Set rng = s5.Range("G1:G" & lastrow)
For Each c In rng
sDFolder = DesktopPathMAIN & "\" & c.Value & "\"
sfile = s5.Range("H1").Value & c.Offset(, -2).Value
Call oFSO.CopyFile(sfile, sDFolder)
Next c
End Sub
When i run the macro it causes error code 76, but if i run again it works perfectly. I realized it happens when the cell changes the value of the destination folder at this line sfile = s5.Range("H1").Value & c.Offset(, -2).Value.
But it only happens 1 time, if i run again it works perfectly.
How can i fix that?
thank you