conda installが使用できない

Question

現在Macでconda環境を使用しているのですが、OpenCVをconda installで入れたところ、 conda install, conda uninstall, conda update を使用する際に必ず以下のようなエラーメッセージが出るようになりました。

(base) User@pc site-packages % conda uninstall opencv
Collecting package metadata (repodata.json): failed
WARNING conda.exceptions:print_unexpected_error_report(1246): KeyError('pkgs_dirs')
Traceback (most recent call last):
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/exceptions.py", line 1114, in __call__
    return func(*args, **kwargs)
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/cli/main.py", line 86, in main_subshell
    exit_code = do_call(args, p)
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/cli/conda_argparse.py", line 90, in do_call
    return getattr(module, func_name)(args, parser)
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/cli/main_remove.py", line 90, in execute
    txn = solver.solve_for_transaction()
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/core/solve.py", line 155, in solve_for_transaction
    should_retry_solve)
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/core/solve.py", line 196, in solve_for_diff
    force_remove, should_retry_solve)
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/core/solve.py", line 300, in solve_final_state
    ssc = self._collect_all_metadata(ssc)
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/common/io.py", line 86, in decorated
    return f(*args, **kwds)
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/core/solve.py", line 435, in _collect_all_metadata
    _supplement_index_with_system(virtual_pkg_index)
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/core/index.py", line 158, in _supplement_index_with_system
    cuda_version = context.cuda_version
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/auxlib/decorators.py", line 268, in new_fget
    cache[inner_attname] = func(self)
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/common/decorators.py", line 24, in wrapper
    return func(*args, **kwargs)
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/base/context.py", line 926, in cuda_version
    return cuda_detect()
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/common/cuda.py", line 37, in cuda_detect
    import ctypes
  File "/opt/miniconda3/lib/python3.7/ctypes/__init__.py", line 7, in <module>
    from _ctypes import Union, Structure, Array
ImportError: dlopen(/opt/miniconda3/lib/python3.7/lib-dynload/_ctypes.cpython-37m-darwin.so, 2): Library not loaded: @rpath/libffi.6.dylib
  Referenced from: /opt/miniconda3/lib/python3.7/lib-dynload/_ctypes.cpython-37m-darwin.so
  Reason: image not found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/exceptions.py", line 1244, in print_unexpected_error_report
    message_builder.append(get_main_info_str(error_report['conda_info']))
  File "/opt/miniconda3/lib/python3.7/site-packages/conda/cli/main_info.py", line 237, in get_main_info_str
    info_dict['_' + key] = ('\n' + 26 * ' ').join(info_dict[key])
KeyError: 'pkgs_dirs'

# >>>>>>>>>>>>>>>>>>>>>> ERROR REPORT <<<<<<<<<<<<<<<<<<<<<<

    Traceback (most recent call last):
      File "/opt/miniconda3/lib/python3.7/site-packages/conda/exceptions.py", line 1114, in __call__
        return func(*args, **kwargs)
      File "/opt/miniconda3/lib/python3.7/site-packages/conda/cli/main.py", line 86, in main_subshell
        exit_code = do_call(args, p)
      File "/opt/miniconda3/lib/python3.7/site-packages/conda/cli/conda_argparse.py", line 90, in do_call
        return getattr(module, func_name)(args, parser)
      File "/opt/miniconda3/lib/python3.7/site-packages/conda/cli/main_remove.py", line 90, in execute
        txn = solver.solve_for_transaction()
      File "/opt/miniconda3/lib/python3.7/site-packages/conda/core/solve.py", line 155, in solve_for_transaction
        should_retry_solve)
      File "/opt/miniconda3/lib/python3.7/site-packages/conda/core/solve.py", line 196, in solve_for_diff
        force_remove, should_retry_solve)
      File "/opt/miniconda3/lib/python3.7/site-packages/conda/core/solve.py", line 300, in solve_final_state
        ssc = self._collect_all_metadata(ssc)
      File "/opt/miniconda3/lib/python3.7/site-packages/conda/common/io.py", line 86, in decorated
        return f(*args, **kwds)
      File "/opt/miniconda3/lib/python3.7/site-packages/conda/core/solve.py", line 435, in _collect_all_metadata
        _supplement_index_with_system(virtual_pkg_index)
      File "/opt/miniconda3/lib/python3.7/site-packages/conda/core/index.py", line 158, in _supplement_index_with_system
        cuda_version = context.cuda_version
      File "/opt/miniconda3/lib/python3.7/site-packages/conda/auxlib/decorators.py", line 268, in new_fget
        cache[inner_attname] = func(self)
      File "/opt/miniconda3/lib/python3.7/site-packages/conda/common/decorators.py", line 24, in wrapper
        return func(*args, **kwargs)
      File "/opt/miniconda3/lib/python3.7/site-packages/conda/base/context.py", line 926, in cuda_version
        return cuda_detect()
      File "/opt/miniconda3/lib/python3.7/site-packages/conda/common/cuda.py", line 37, in cuda_detect
        import ctypes
      File "/opt/miniconda3/lib/python3.7/ctypes/__init__.py", line 7, in <module>
        from _ctypes import Union, Structure, Array
    ImportError: dlopen(/opt/miniconda3/lib/python3.7/lib-dynload/_ctypes.cpython-37m-darwin.so, 2): Library not loaded: @rpath/libffi.6.dylib
      Referenced from: /opt/miniconda3/lib/python3.7/lib-dynload/_ctypes.cpython-37m-darwin.so
      Reason: image not found

`$ /opt/miniconda3/bin/conda uninstall opencv`

  environment variables:
conda info could not be constructed.
KeyError('pkgs_dirs')

An unexpected error has occurred. Conda has prepared the above report.

If submitted, this report will be used by core maintainers to improve
future releases of conda.
Would you like conda to send this report to the core maintainers?

[y/N]: n

No report sent. To permanently opt-out, use

    $ conda config --set report_errors false

元々入っているpipと競合してしまった可能性も考えたのですが、エラー文を読んでもどこに原因があるのかわからず、どう対処して良いかわからない状態です。
お手数ですが、どなたかご助力いただけないでしょうか。

Comments

[jbpb0]

> Library not loaded: @rpath/libffi.6.dylib

これかな
https://sotani.vivaldi.net/2020/07/26/python%E3%81%AE%E5%8B%89%E5%BC%B7%E3%81%97%E3%82%88%E3%81%86%E3%81%A8%E3%81%97%E3%81%9F%E3%82%89miniconda%E3%81%8C%E6%AD%BB%E3%82%93%E3%81%A7%E3%81%84%E3%81%9F%E3%81%A8%E3%81%84%E3%81%86%E4%BB%B6/

[exxx029]

迅速な回答ありがとうございます！
送っていただいた記事と同様のエラーだったようで、無事解決出来ました。

Answer 1

質問追記に送っていただいた記事の通り、以下のコマンドでシンボリックリンクを作成するとエラーが消えました。迅速な回答ありがとうございました。

(base) lib % ln -s libffi.7.dylib libffi.6.dylib