NAs values in all the columns of covariates file

Hello everyone,
I used peerfactor tool to develop covariates file for my gene_Expression data using the predictdb tutorial.
But its giving me NA for all the columns.
I used this command:
./peertool -f 'gene_exp.csv' -n 45 --has_header -o ./peerout

I have attached a screenshot of how my covariates file look like:
Have I done something wrong during the analysis? Is there any way to solve this error
Thank you.