I am trying to do motif analysis on a set of ATAC peaks with findMotifsGenome.pl using HOMER installed on a computer cluster. I submit a simple slurm job:

#!/bin/bash
#SBATCH -J HOMER.test
#SBATCH -o %A_%a.out.txt
#SBATCH -e %A_%a.err.txt
#SBATCH --mem=24G
#SBATCH -n 8
#SBATCH --mail-type=END
#SBATCH --mail-user=xxyyxx@institution.edu

findMotifsGenome.pl homer.peaks.test.txt GRCh38.p13.genome.fa ./homer.test/ -size 200 -mask

and receive the following .err.txt file:

Position file = homer.peaks.test.txt
Genome = GRCh38.p13.genome.fa
Output Directory = ./homer.test/
Fragment size set to 200
Will use repeat masked sequences
Using Custom Genome
!!! Could not open peak/position file homer.peaks.test.txt !!!

I formatted the peak.txt file tab delimited with all the columns specified on the website.