DESeq2 error while using locally ran featurecounts results as input


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?

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