Traceback (most recent call last):
  File "/usr/lib/python3.10/runpy.py", line 196, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.10/runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "/build/python-libcst/src/LibCST-0.3.20/libcst/codegen/generate.py", line 168, in <module>
    sys.exit(main(sys.argv[1:]))
  File "/build/python-libcst/src/LibCST-0.3.20/libcst/codegen/generate.py", line 157, in main
    codegen_matchers()
  File "/build/python-libcst/src/LibCST-0.3.20/libcst/codegen/generate.py", line 115, in codegen_matchers
    format_file(matchers_file)
  File "/build/python-libcst/src/LibCST-0.3.20/libcst/codegen/generate.py", line 30, in format_file
    subprocess.check_call(["black", fname], stdout=devnull, stderr=devnull)
  File "/usr/lib/python3.10/subprocess.py", line 369, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['black', '/build/python-libcst/src/LibCST-0.3.20/libcst/matchers/__init__.py']' returned non-zero exit status 1.
==> ERROR: A failure occurred in prepare().
    Aborting...