When running attract, an error is returned that I'm unsure of how to go about trouble shooting it: #Error in cutree(clust.pway, k = jval) : # elements of 'k' must be between 1 and 5 If I set removeGenes to NULL: for ( i in KEGG.ids ) { temp <- findSynexprs(trim(i), attractor.states) } The code runs smoothly and doesn't error out. Please help me change my if-else statement to account for this possible error (as I had hoped to construct it). Cheers and Thanks! -- output of sessionInfo(): for ( i in KEGG.ids ) { temp <- findSynexprs(trim(i), attractor.states, flatgenes) if ( (length(attributes(temp))) == 0 ){) temp <- findSynexprs(trim(i), attractor.states) } else { temp <- temp } } #Error in cutree(clust.pway, k = jval) : # elements of 'k' must be between 1 and 5 -- Sent via the guest posting facility at bioconductor.org.