VBA: Named Argument Not Found error

Ok, this code works fine:

detailsSheet.Cells.Copy
Cells.Select
Selection.Copy
Selection.PasteSpecial Paste:=xlPasteValues

But conscious that using Selection can be slower, I tried:

detailsSheet.Cells.Copy
detailsSheet.PasteSpecial Paste:=xlPasteValues

This gives me a compile error, "named argument not found".
(details.Sheet is set elsewhere, on a user form, as a worksheet)

Also posted here: http://www.mrexcel.com/forum/e…nd-error.html#post4548758

Re: VBA: Named Argument Not Found error

Hmm, seem to have solved it with:

detailsSheet.Range("A1").PasteSpecial Paste:=xlPasteValues

Could someone explain why this works but:

detailsSheet.PasteSpecial Paste:=xlPasteValues

doesn't? Thanks