Error: "metadata generation failed", can't install Artic Module

Question

I am trying to get started with downloading this project: https://github.com/sadighian/crypto-rl

And I've downloaded the packages in the requirements file but I can't figure out why the artic package won't download. I am getting this error:

  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [312 lines of output]
      /Users/aishahalane/venv/lib/python3.9/site-packages/setuptools/installer.py:27: SetuptoolsDeprecationWarning: setuptools.installer is deprecated. Requirements should be satisfied by a PEP 517 installer.
        warnings.warn(
        error: subprocess-exited-with-error
      
        × Building wheel for numpy (pyproject.toml) did not run successfully.
        │ exit code: 1
        ╰─> [269 lines of output]
            …
            error: Command "/opt/concourse/worker/volumes/live/c1a1a6ef-e724-4ad9-52a7-d6d68451dacb/volume/python-split_1631807121927/_build_env/bin/llvm-ar rcs build/temp.macosx-10.9-x86_64-3.9/libnpymath.a build/temp.macosx-10.9-x86_64-3.9/numpy/core/src/npymath/npy_math.o build/temp.macosx-10.9-x86_64-3.9/build/src.macosx-10.9-x86_64-3.9/numpy/core/src/npymath/ieee754.o build/temp.macosx-10.9-x86_64-3.9/build/src.macosx-10.9-x86_64-3.9/numpy/core/src/npymath/npy_math_complex.o build/temp.macosx-10.9-x86_64-3.9/numpy/core/src/npymath/halffloat.o" failed with exit status 127
            [end of output]
      
        note: This error originates from a subprocess, and is likely not a problem with pip.
        ERROR: Failed building wheel for numpy
      ERROR: Failed to build one or more wheels
      Traceback (most recent call last):
        File "/Users/aishahalane/venv/lib/python3.9/site-packages/setuptools/installer.py", line 82, in fetch_build_egg
          subprocess.check_call(cmd)
        File "/Users/aishahalane/opt/anaconda3/lib/python3.9/subprocess.py", line 373, in check_call
          raise CalledProcessError(retcode, cmd)
      subprocess.CalledProcessError: Command '['/Users/aishahalane/venv/bin/python3', '-m', 'pip', '--disable-pip-version-check', 'wheel', '--no-deps', '-w', '/var/folders/_p/xqkc7m_n2_ngn8wdd3pgytp80000gn/T/tmph3_m5ewf', '--quiet', 'numpy<=1.18.4']' returned non-zero exit status 1.
      
      The above exception was the direct cause of the following exception:
      
      Traceback (most recent call last):
        File "<string>", line 2, in <module>
        File "<pip-setuptools-caller>", line 34, in <module>
        File "/private/var/folders/_p/xqkc7m_n2_ngn8wdd3pgytp80000gn/T/pip-req-build-s7mgwt47/setup.py", line 59, in <module>
          setup(
        File "/Users/aishahalane/venv/lib/python3.9/site-packages/setuptools/__init__.py", line 154, in setup
          _install_setup_requires(attrs)
        File "/Users/aishahalane/venv/lib/python3.9/site-packages/setuptools/__init__.py", line 148, in _install_setup_requires
          dist.fetch_build_eggs(dist.setup_requires)
        File "/Users/aishahalane/venv/lib/python3.9/site-packages/setuptools/dist.py", line 812, in fetch_build_eggs
          resolved_dists = pkg_resources.working_set.resolve(
        File "/Users/aishahalane/venv/lib/python3.9/site-packages/pkg_resources/__init__.py", line 771, in resolve
          dist = best[req.key] = env.best_match(
        File "/Users/aishahalane/venv/lib/python3.9/site-packages/pkg_resources/__init__.py", line 1056, in best_match
          return self.obtain(req, installer)
        File "/Users/aishahalane/venv/lib/python3.9/site-packages/pkg_resources/__init__.py", line 1068, in obtain
          return installer(requirement)
        File "/Users/aishahalane/venv/lib/python3.9/site-packages/setuptools/dist.py", line 883, in fetch_build_egg
          return fetch_build_egg(self, req)
        File "/Users/aishahalane/venv/lib/python3.9/site-packages/setuptools/installer.py", line 84, in fetch_build_egg
          raise DistutilsError(str(e)) from e
      distutils.errors.DistutilsError: Command '['/Users/aishahalane/venv/bin/python3', '-m', 'pip', '--disable-pip-version-check', 'wheel', '--no-deps', '-w', '/var/folders/_p/xqkc7m_n2_ngn8wdd3pgytp80000gn/T/tmph3_m5ewf', '--quiet', 'numpy<=1.18.4']' returned non-zero exit status 1.
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.

How do I solve this problem?

Answer 1

I had this error while trying to install dotenv. With this command:

pip install dotenv

For anyone facing this error with dotenv. The right command actually is:

pip install python-dotenv

Answer 2

I faced a similar issue, due a recent change in pip. I solved it by adding the following to the installation command:

--use-deprecated=backtrack-on-build-failures

E.g. instead of pip install numpy I now ran:

pip install numpy --use-deprecated=backtrack-on-build-failures

Answer 3

I had the same problem with metadata-generation-failed. This GitHub issue comment helped me (Ubuntu 18.04):

sudo apt-get install python-dev 
sudo apt-get install build-essential
python -m pip install -U pip or python3 -m pip install -U pip 
pip3 install --upgrade setuptools

Answer 4

pip install numpy --use-deprecated=legacy-resolver can actually help, but there will be a red warning: pip's legacy dependency resolver does not consider dependency conflicts when selecting packages. anyway it solve my problem!

Answer 5

Downgrading setuptools worked for me

pip install "setuptools<58.0.0"