VBA to save a file based upon the date

Good afternoon,

I have written a piece of code to save a file based upon the current date (both the directory and file name are affected).
Whenever I run the macro however, I am given a runtime error '1004' and the message that the file has not been saved. When I debug, it is the final line of my code which is highlighted, but I cannot ascertain the error - please can you help?

Sub savefile()
Dim year As String
Dim path As String
Dim month As String
Dim month2 As String
Dim month3 As String

year = DatePart("yyyy", Date)
month = Format(Now, "mm")
month2 = MonthName(month)
month3 = Format(Now, "ddmmyy")

ActiveWorkbook.SaveAs Filename:="F:\DOCS\Finance\PRIVATE\Sales Ledger\Ledger\" & year & "\" & month & " " & month2 & "\Ledger" & " " & month3 & ".xlsx"

End Sub

* were this to be saved today for example, the correct file path and name would be:

F:\DOCS\Finance\PRIVATE\Sales Ledger\Ledger\2012\01 January\Ledger 250112.xlsx

Kind thanks,

Ryan