How To Copy Excel Sheet From One Workbook To Another

[Rob94]

The code snippet below works under NT, but is failing when I run this in Windows XP:

'copy current invoice to the master invoice 
'workbook, place at beginning of workbook
xlsheet.Copy(xlMasterWorkbook.Sheets(1))

if err.number <> 0 then
  MsgBox "Error " & Err.number & ": " & Err.description
end if

When I run this, I get the following error:
"Error 1004: Copy method of Worksheet class failed"
Any suggestions would be greatly appreciated.