I am trying to set two workbook variables - here are the first four lines of my code:

```
Dim wb1 As Workbook
Dim wb2 As Workbook

Set wb1 = Workbooks("C:\Users\ShaneM\Documents\File1.xlsx")
Set wb2 = Workbooks("C:\Users\ShaneM\Documents\Computer Languages\VBA\File2.xlsm")

```

The error I am getting on line 3 is:

```
Runtime error 9 - Subscript Out Of Range

```

The files definitely exist in these locations. Obviously much learning to be done. What am I doing wrong, please?

Thank you.