A question about PCA.R

[mayupsc]

Hi Dr.Fu,
I've encountered a problem when ran PCA.R
in line 23, I got an error :
Error in strsplit(config$seq_info$replicate, "+", fixed = T) :
non-character argument

I change line23 to grepl('+', config$seq_info$replicate,fixed = T)
and it works well

by the way, your venn.R is awesome