GSTAr.pl probelm running

Hi,
I want to run CleaveLand to analyze my degradome sequencing, however, I run with the below error. The resulting file is empty and when I check the Checking Dependencies, it shows me GSTAr: FAIL. I always get this error even running with the tutorial files.

Mode: 1
Checking Dependencies
bowtie: PASS: /usr/bin/bowtie
bowtie-build: PASS: /usr/bin/bowtie-build
RNAplex: PASS RNAplex 2.2.9
GSTAr: FAIL

I appreciate that if you help me out.