I was wondering what "universe" for enrichMesh function accepts as an input.

{R} library(meshes) x <- enrichMeSH(my.geneID3[,3], MeSHDb = "MeSH.Hsa.eg.db", database='gene2pubmed', category = 'C',universe = univ.geneID3[,2]) here, univ.geneID3[,2] is a list of entrez gene ids but I get the error

Error in validObject(.Object) : invalid class "enrichResult" object: invalid object for slot "universe" in class "enrichResult": got class "integer", should be or extend class "character"

thanks so much!

michelle