Keep getting the following error when trying to add annotation to my data:

# ADDING ANNOTATION
> columns(org.Mm.eg.db)
Error in columns(org.Mm.eg.db) : could not find function "columns"
> ann <- select(org.Mm.eg.db,keys=rownames(y$counts), keytype = "ENSEMBL", columns=c("ENSEMBL","SYMBOL","GENENAME"))
Error in select(org.Mm.eg.db, keys = rownames(y$counts), keytype = "ENSEMBL",  : could not find function "select"