Hi Tinfanide,
The error is probably because you're not telling the calling App that it's AppWord's ActiveDocument you want to save. Try something along the lines of:
Code:
Private Sub copytoWord_Click()
Sheets("Sheet1").Range("A1:B4").Copy
Dim AppWord As Word.Application
Set AppWord = CreateObject("Word.Application")
With AppWord
.Visible = True
.Documents.Add
.Selection.Paste
.CutCopyMode = False
.ActiveDocument.SaveAs2 "C:\Users\Tin\Desktop\" & "Book1", wdFormatDocumentDefault
.Quit
End With
Set AppWord = Nothing
End Sub