Bug in quantmod library?

Hi,

Just starting to play around with some derivative pricing models and I 
need an easy way to download option chain data.  The quantmod package 
has a function for this, but it appears to be broken.

I just calling it as:   x <- getOptionChain("AAPL", Exp = NULL, src="yahoo")

Alternately, can anyone suggest an easy way to get option chain data 
directly into R?


Thanks!

-N