You may want to verify that a non network folder exists before attempting such.
e.g.
[VBA]Dim s As String
s = "c:\"
If Dir(s, vbDirectory) = "" Then
MsgBox s & " does not exist."
Else: MsgBox s & " does exist."
End If[/VBA]

Otherwise, post your code. Obviously, we can't test for specific network folders.