On 14/05/2009, at 3:44 PM, Vafa Khalighi wrote:

> Strange, this gives the same error on my machine as the previous one.

I just copied the example I sent into a new file and it seems fine to  
me.

> But it works for you so probably there is something odd about it on  
> my machine. So the problem goes back to my own TeX settings.

The only thing I can think of is that you've modified your local copy  
of array.sty. Otherwise there shouldn't be any problem.

Will