Macro returning Error Message

I now have a problem when writing even a simple Macro eg

Sub Unit2()
'
' Unit2 Macro
'

'
Sheets("Units").Select
range("A1").Select
End Sub

I get Compilation Error
Wrong number of arguments or Invalid Property Assignment

It appears to only happen in one workbook, as the same macro takes me to Cell A! in a sheet called "Units"

Can anyone make some suggestions as I have nearly finished the whole workbook, and this is stuffing me up.