non-zero exit status 255 Error on Mac while running mgefinder

[chandanabasak]

New to programming can't really understand what it means!
Please help.
Thank you in advance.
` mgefinder

CHECKING DEPENDENCIES

Current version of snakemake: 3.13.3
Expected version of snakemake: 3.13.3
Current version of einverted: EMBOSS:6.6.0.0
Expected version of einverted: EMBOSS:6.6.0.0
Traceback (most recent call last):
File "/Users/thsti/miniconda3/envs/mgefinder/bin/mgefinder", line 5, in
from mgefinder.main import cli
File "/Users/thsti/miniconda3/envs/mgefinder/lib/python3.6/site-packages/mgefinder/main.py", line 38, in
check_dependencies()
File "/Users/thsti/miniconda3/envs/mgefinder/lib/python3.6/site-packages/mgefinder/dependencies.py", line 39, in check_dependencies
bowtie2_checker.check(extract_version=lambda x: x.split()[2])
File "/Users/thsti/miniconda3/envs/mgefinder/lib/python3.6/site-packages/mgefinder/dependencies.py", line 12, in check
output = shell(cmd.format(tool=self.tool), read=True).decode('utf-8').strip()
File "/Users/thsti/miniconda3/envs/mgefinder/lib/python3.6/site-packages/snakemake/shell.py", line 88, in new
raise sp.CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command 'bowtie2 --version 2>&1' returned non-zero exit status 255.`