I am running the command: kb ref -i index.idx -g t2g.txt -f1 cdna.fasta genome.fasta genome.gtf
where genome.fasta= Homo_sapiens.GRCh38.cdna.all.fa.gz and genome.gtf= Homo_sapiens.GRCh38.112.gtf.gz
However, I am getting an error message (what should I do?):