Hi Rabia,
I'm new on R like you but i have some experience with this type of analysis
So in your case verify that your probeset.list contain some gene DE  !!
att the first tap this :

head(probeset.list)  and told me the result !!




2014-04-01 13:22 GMT+01:00 Rabia [guest] <guest@bioconductor.org>:

>
> HI,
> I am new to R.I am using a windows base system.
> I am following the tut by Daniel Swan.
> After writing the following command
> > gene.symbols <- getSYMBOL(probeset.list$ID, "hgu133plus2")
>
>  get this eror:
> Error in unlist(lookUp(x, data, "SYMBOL")) :
>   error in evaluating the argument 'x' in selecting a method for function
> 'unlist': Error in lookUp(x, data, "SYMBOL") : No keys provided command
>
> Can any one help.
> rabia
>
>  -- output of sessionInfo():
>
> > gene.symbols <- getSYMBOL(probeset.list$ID, "hgu133plus2")
> Error in unlist(lookUp(x, data, "SYMBOL")) :
>   error in evaluating the argument 'x' in selecting a method for function
> 'unlist': Error in lookUp(x, data, "SYMBOL") : No keys provided
>
> --
> Sent via the guest posting facility at bioconductor.org.
>
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