Hi,
I have a  problem when working with GOSeq. There is support for mm10 genome but not Gene ID geneSymbol
I am trying to get length information by following the Goseq manual but I still dont understand. So, could you please show me a little details how to get the length information for mm10 genome and geneID geneSymbol ?

>genes = as.integer(all.genes %in% F.genes)
> names(genes) = all.genes 
> head(genes)
Cryba1 Cryba4 Cryga Crygb Crygc Crygd 
1 1 1 1 1 1 
> pwf=nullp(genes,"mm10", "geneSymbol") 
Can't find mm10/geneSymbol length data in genLenDataBase... Trying to download from UCSC. This might take a couple of minutes. 
Error in value[[3L]](cond) : 
Length information for genome mm10 and gene ID geneSymbol is not available. You will have to specify bias.data manually.
Thank you so much for your help
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