xx <- compareCluster(gcSample,
                     fun = "enrichKEGG",
                     organism = "mmu", pvalueCutoff = 0.05
)

Error in download.KEGG.Path(species) : 'species' should be one of organisms listed in 'http://www.genome.jp/kegg/catalog/org_list.html'... In addition: Warning message: In utils::download.file(url, quiet = TRUE, method = method, ...) : URL 'https://rest.kegg.jp/link/mmu/pathway': status was 'Failure when receiving data from the peer'

解决方法

install.packages("R.utils")
R.utils::setOption("clusterProfiler.download.method",'auto')