Using Command Button To Clear Cells

I have created a command button, right clicked the button and selected 'View Code'. In the code window I've entered the following code:

Private Sub CommandButton1_Click()
IB_FB_Hedge_3 Outcome.range(W10:X11).ClearContents
End Sub

As soon as I enter the code a message pops up:

"Compile error:

Expected: list separator or )"

Is my syntax wrong? Is the sheet name, 'IB_FB_Hedge_3 Outcome' not allowed?

When I created this code a few minutes before I was not having the 'Compile error' problem, but the Command Button was not working either. When I clicked the command button it would just show the circles at the corners, suggesting that it is still in editing mode and not properly activated as a command button.