Excel make new chart sheet

I am trying to make a new chart sheet (not just a chart) via applescript. Excel keeps crashing using this code:


tell application "Microsoft Excel"
	tell active workbook
		make new chart sheet at end
	end tell
end tell

I’m sure this is really simple, but what am I missing? I’ve tried this on both Excel 2008 & 2011.

Model: MacBook Pro 2.66GHz Intel Core 2 Duo
AppleScript: 2.1.2
Browser: Safari 533.17.8
Operating System: Mac OS X (10.6)