ERROR: "AttributeError: 'Lock' object has no attribute 'is_fork_ctx'" when trying to install a game

[unkown328]

This happens right at the start of the installation and I don't know how to fix it. Does anyone know what perhaps is the reason for this?

Heres a full stack-trace:

[Core] INFO: Trying to re-use existing login session...
[cli] INFO: Preparing download for "Magic The Gathering Arena" (stargazer)...
[Core] INFO: Parsing game manifest...
[Core] INFO: Install path: /Users/username/Applications
[Core] INFO: Selected CDN: download.epicgames.com (https)
[DLM] INFO: Found 144 missing files.
[cli] INFO: Install size: 482.85 MiB
[cli] INFO: Download size: 185.57 MiB (Compression savings: 61.8%)
[cli] INFO: Reusable size: 0.00 MiB (chunks) / 0.00 MiB (unchanged / skipped)
[cli] INFO: Downloads are resumable, you can interrupt the download with CTRL-C and resume it using the same command later on.
Do you wish to install "Magic The Gathering Arena"? [Y/n]: y
[DLManager] INFO: Download Manager running with process-id: 14253
[DLManager] INFO: Starting download workers...
Process DLManager:
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
self.run()
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/legendary/downloader/mp/manager.py", line 606, in run
self.run_real()
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/legendary/downloader/mp/manager.py", line 663, in run_real
w.start()
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/multiprocessing/process.py", line 121, in start
self._popen = self._Popen(self)
^^^^^^^^^^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/multiprocessing/context.py", line 224, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/multiprocessing/context.py", line 288, in _Popen
return Popen(process_obj)
^^^^^^^^^^^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/multiprocessing/popen_spawn_posix.py", line 32, in init
super().init(process_obj)
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/multiprocessing/popen_fork.py", line 19, in init
self._launch(process_obj)
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/multiprocessing/popen_spawn_posix.py", line 47, in _launch
reduction.dump(process_obj, fp)
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/multiprocessing/reduction.py", line 60, in dump
ForkingPickler(file, protocol).dump(obj)
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/multiprocessing/synchronize.py", line 106, in getstate
if self.is_fork_ctx:
^^^^^^^^^^^^^^^^
AttributeError: 'Lock' object has no attribute 'is_fork_ctx'
[cli] INFO: Finished installation process in 0.14 seconds.
/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/multiprocessing/resource_tracker.py:224: UserWarning: resource_tracker: There appear to be 1 leaked shared_memory objects to clean up at shutdown
warnings.warn('resource_tracker: There appear to be %d '

[derrod]

This is a bug in python 3.11, hopefully they'll release a fix soon: python/cpython#108520

Use python 3.10 for now.

[unkown328]

Thank you so much!

[vapidinfinity]

patched in python 3.11.6

[unkown328]

Thank you for your help. I tried upgrading to the newest version of python with brew upgrade python and after the installation it always says: "python 3.11.6_1 already installed", but when I use "python --version" it always says "Python 3.11.5" and the error in legendary still persists.
I also have python installed under the command "python3" but that has the same version as the other python after updating. I don't know what python is being used by legendary but they both say that the version is still 3.11.5 even though the update says that it's 3.11.6_1 . Do you maybe know how to solve this issue?

[vapidinfinity]

i'm unsure but my best guess would be to run:
brew reinstall --force python@3.11

[unkown328]

I tried it and it still shows "3.11.5" but thanks for the idea

[unkown328]

I finally solved it: I had anaconda installed because I tried to force the correct version with it too. I deleted it completely and now its finally showing me the newest version lol