AttributeError: module 'enum' has no attribute '__version__' when installing pySim

Hi. I want to use pySim to check my own SIM applet. But there is ERROR when installing pySim. pySim requires smpp.pdu-0.3. So I tried to install smpp.pdu-0.3. But it show following error like following. Error is due to "AttributeError: module 'enum' has no attribute '__version__'" Could help me solve the problem. (vpy) quectel-sw@quectelsw-keipy:~/work/04_usim/smpp.pdu-0.3$ (vpy) quectel-sw@quectelsw-keipy:~/work/04_usim/smpp.pdu-0.3$ sudo python3.9 setup.py install --user running install .......... Traceback (most recent call last): File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 154, in save_modules yield saved File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 195, in setup_context yield File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 250, in run_setup _execfile(setup_script, ns) File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 45, in _execfile exec(code, globals, locals) File "/tmp/easy_install-rbrdenj3/enum-0.4.7/setup.py", line 24, in <module> test_suite = 'smpp.pdu.tests', AttributeError: module 'enum' has no attribute '__version__' During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/home/quectel-sw/work/04_usim/smpp.pdu-0.3/setup.py", line 6, in <module> setup( File "/usr/lib/python3/dist-packages/setuptools/__init__.py", line 144, in setup return distutils.core.setup(**attrs) File "/usr/lib/python3.9/distutils/core.py", line 148, in setup dist.run_commands() File "/usr/lib/python3.9/distutils/dist.py", line 966, in run_commands self.run_command(cmd) File "/usr/lib/python3.9/distutils/dist.py", line 985, in run_command cmd_obj.run() File "/usr/lib/python3/dist-packages/setuptools/command/install.py", line 67, in run self.do_egg_install() File "/usr/lib/python3/dist-packages/setuptools/command/install.py", line 117, in do_egg_install cmd.run(show_deprecation=False) File "/usr/lib/python3/dist-packages/setuptools/command/easy_install.py", line 450, in run self.easy_install(spec, not self.no_deps) File "/usr/lib/python3/dist-packages/setuptools/command/easy_install.py", line 693, in easy_install return self.install_item(None, spec, tmpdir, deps, True) File "/usr/lib/python3/dist-packages/setuptools/command/easy_install.py", line 740, in install_item self.process_distribution(spec, dist, deps) File "/usr/lib/python3/dist-packages/setuptools/command/easy_install.py", line 784, in process_distribution distros = WorkingSet([]).resolve( File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 781, in resolve dist = best[req.key] = env.best_match( File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 1066, in best_match return self.obtain(req, installer) File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 1078, in obtain return installer(requirement) File "/usr/lib/python3/dist-packages/setuptools/command/easy_install.py", line 712, in easy_install return self.install_item(spec, dist.location, tmpdir, deps) File "/usr/lib/python3/dist-packages/setuptools/command/easy_install.py", line 738, in install_item dists = self.install_eggs(spec, download, tmpdir) File "/usr/lib/python3/dist-packages/setuptools/command/easy_install.py", line 923, in install_eggs return self.build_and_install(setup_script, setup_base) File "/usr/lib/python3/dist-packages/setuptools/command/easy_install.py", line 1191, in build_and_install self.run_setup(setup_script, setup_base, args) File "/usr/lib/python3/dist-packages/setuptools/command/easy_install.py", line 1177, in run_setup run_setup(setup_script, args) File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 253, in run_setup raise File "/usr/lib/python3.9/contextlib.py", line 135, in __exit__ self.gen.throw(type, value, traceback) File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 195, in setup_context yield File "/usr/lib/python3.9/contextlib.py", line 135, in __exit__ self.gen.throw(type, value, traceback) File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 166, in save_modules saved_exc.resume() File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 141, in resume six.reraise(type, exc, self._tb) File "/usr/lib/python3/dist-packages/setuptools/_vendor/six.py", line 685, in reraise raise value.with_traceback(tb) File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 154, in save_modules yield saved File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 195, in setup_context yield File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 250, in run_setup _execfile(setup_script, ns) File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 45, in _execfile exec(code, globals, locals) File "/tmp/easy_install-rbrdenj3/enum-0.4.7/setup.py", line 24, in <module> test_suite = 'smpp.pdu.tests', AttributeError: module 'enum' has no attribute '__version__' (vpy) quectel-sw@quectelsw-keipy:~/work/04_usim/smpp.pdu-0.3$ https://www.quectel.com/ Young Hwan Kim | Software Engineer | Quectel Wireless Solutions Co., Ltd. <https://www.quectel.com/> Mobile: +82-10 4239 3254 | Email : younghwan.kim(a)quectel.com | Tel: +82-31-698-2067<https://www.quectel.com/> Website: https://www.quectel.com/ | Wechat: wxid_pim1xd90yibj22<https://www.quectel.com/> 2nd Floor, 26, Hwangsaeul-ro 312 beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea<https://www.quectel.com/> [???, ??? 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