DESeq2 error while using locally ran featurecounts results as input

1

Hi,

I am trying to run DESeq2 tool at galaxy enviroment. I have featurCounts outputs 14 patient and 3 normal sample.

I am taking following error:

Error in levels<-(*tmp*, value = as.character(levels)) :
factor level [2] is duplicated
Calls: factor

How can I interpret featurecounts results to galaxy?
Should I use any other tool to manipulate count data?