仮想環境構築、conda createでのエラーの解決策（solving environment: failed)

前提・実現したいこと

機械学習を勉強中です。
今回tensorflowを使用するための仮想環境を構築しようと、

zsh
1$ conda create -n tensorflow python=3.6 anaconda

としたところ、エラーがでて、自力で対処できなくなりました。

対処方法について教えていただきたいです。
よろしくお願いいたします。

ホームディレクトリ名は******としています。

発生している問題・エラーメッセージ

zsh
1$ conda create -n tensorflow python=3.6 anaconda
2Solving environment: failed
3
4# >>>>>>>>>>>>>>>>>>>>>> ERROR REPORT <<<<<<<<<<<<<<<<<<<<<<
5
6    Traceback (most recent call last):
7      File "/anaconda3/lib/python3.6/site-packages/conda/exceptions.py", line 819, in __call__
8        return func(*args, **kwargs)
9      File "/anaconda3/lib/python3.6/site-packages/conda/cli/main.py", line 78, in _main
10        exit_code = do_call(args, p)
11      File "/anaconda3/lib/python3.6/site-packages/conda/cli/conda_argparse.py", line 77, in do_call
12        exit_code = getattr(module, func_name)(args, parser)
13      File "/anaconda3/lib/python3.6/site-packages/conda/cli/main_create.py", line 11, in execute
14        install(args, parser, 'create')
15      File "/anaconda3/lib/python3.6/site-packages/conda/cli/install.py", line 235, in install
16        force_reinstall=context.force,
17      File "/anaconda3/lib/python3.6/site-packages/conda/core/solve.py", line 518, in solve_for_transaction
18        force_remove, force_reinstall)
19      File "/anaconda3/lib/python3.6/site-packages/conda/core/solve.py", line 451, in solve_for_diff
20        final_precs = self.solve_final_state(deps_modifier, prune, ignore_pinned, force_remove)
21      File "/anaconda3/lib/python3.6/site-packages/conda/core/solve.py", line 180, in solve_final_state
22        index, r = self._prepare(prepared_specs)
23      File "/anaconda3/lib/python3.6/site-packages/conda/core/solve.py", line 592, in _prepare
24        self.subdirs, prepared_specs)
25      File "/anaconda3/lib/python3.6/site-packages/conda/core/index.py", line 215, in get_reduced_index
26        new_records = query_all(spec)
27      File "/anaconda3/lib/python3.6/site-packages/conda/core/index.py", line 184, in query_all
28        return tuple(concat(future.result() for future in as_completed(futures)))
29      File "/anaconda3/lib/python3.6/site-packages/conda/core/subdir_data.py", line 95, in query
30        self.load()
31      File "/anaconda3/lib/python3.6/site-packages/conda/core/subdir_data.py", line 149, in load
32        _internal_state = self._load()
33      File "/anaconda3/lib/python3.6/site-packages/conda/core/subdir_data.py", line 227, in _load
34        mod_etag_headers.get('_mod'))
35      File "/anaconda3/lib/python3.6/site-packages/conda/core/subdir_data.py", line 437, in fetch_repodata_remote_request
36        timeout=timeout)
37      File "/anaconda3/lib/python3.6/site-packages/requests/sessions.py", line 521, in get
38        return self.request('GET', url, **kwargs)
39      File "/anaconda3/lib/python3.6/site-packages/requests/sessions.py", line 499, in request
40        prep.url, proxies, stream, verify, cert
41      File "/anaconda3/lib/python3.6/site-packages/requests/sessions.py", line 672, in merge_environment_settings
42        env_proxies = get_environ_proxies(url, no_proxy=no_proxy)
43      File "/anaconda3/lib/python3.6/site-packages/requests/utils.py", line 692, in get_environ_proxies
44        if should_bypass_proxies(url, no_proxy=no_proxy):
45      File "/anaconda3/lib/python3.6/site-packages/conda/gateways/connection/__init__.py", line 10, in should_bypass_proxies_patched
46        return should_bypass_proxies_func(url, no_proxy)
47      File "/anaconda3/lib/python3.6/site-packages/requests/utils.py", line 676, in should_bypass_proxies
48        bypass = proxy_bypass(netloc)
49      File "/anaconda3/lib/python3.6/urllib/request.py", line 2612, in proxy_bypass
50        return proxy_bypass_macosx_sysconf(host)
51      File "/anaconda3/lib/python3.6/urllib/request.py", line 2589, in proxy_bypass_macosx_sysconf
52        return _proxy_bypass_macosx_sysconf(host, proxy_settings)
53      File "/anaconda3/lib/python3.6/urllib/request.py", line 2575, in _proxy_bypass_macosx_sysconf
54        if (hostIP >> mask) == (base >> mask):
55    ValueError: negative shift count
56
57`$ /anaconda3/bin/conda create -n tensorflow python=3.6 anaconda`
58
59  environment variables:
60                 CIO_TEST=<not set>
61               CONDA_ROOT=/anaconda3
62                     PATH=/Users/******/.pyenv/shims:/Users/******/.pyenv/bin:/ana
63                          conda3/bin:/Users/******/anaconda3/bin:/Library/Frameworks/Pyth
64                          on.framework/Versions/3.6/bin:/Library/Frameworks/Python.framework/Ver
65                          sions/3.6/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/
66                          sbin:/opt/X11/bin
67       REQUESTS_CA_BUNDLE=<not set>
68            SSL_CERT_FILE=<not set>
69
70     active environment : None
71       user config file : /Users/******/.condarc
72 populated config files : /Users/******/.condarc
73          conda version : 4.5.12
74    conda-build version : 3.4.1
75         python version : 3.6.8.final.0
76       base environment : /anaconda3  (writable)
77           channel URLs : https://repo.anaconda.com/pkgs/main/osx-64
78                          https://repo.anaconda.com/pkgs/main/noarch
79                          https://repo.anaconda.com/pkgs/free/osx-64
80                          https://repo.anaconda.com/pkgs/free/noarch
81                          https://repo.anaconda.com/pkgs/r/osx-64
82                          https://repo.anaconda.com/pkgs/r/noarch
83                          https://repo.anaconda.com/pkgs/pro/osx-64
84                          https://repo.anaconda.com/pkgs/pro/noarch
85                          https://conda.anaconda.org/conda-forge/osx-64
86                          https://conda.anaconda.org/conda-forge/noarch
87          package cache : /anaconda3/pkgs
88                          /Users/******/.conda/pkgs
89       envs directories : /anaconda3/envs
90                          /Users/******/.conda/envs
91               platform : osx-64
92             user-agent : conda/4.5.12 requests/2.18.4 CPython/3.6.8 Darwin/18.6.0 OSX/10.14.5
93                UID:GID : 501:20
94             netrc file : None
95           offline mode : False
96
97
98An unexpected error has occurred. Conda has prepared the above report.

試したこと

インターネットで検索して、PATHを通す、という解決策がでてきたので、~/.zshrc に下記を追加してみましたがだめでした。

vim
1 export PATH="\anaconda3\Library\bin:$PATH"

他にもanacondaに関連しそうなパスがかかれていたので、のせておきます。

vim
1 25 # added by Anaconda3 5.1.0 installer
2 26 export PATH="/Users/******/.pyenv/versions/anaconda3/bin:$PATH"
3 27
4 28 # added by Anaconda3 5.1.0 installer
5 29 export PATH="/anaconda3/bin:$PATH"
6 30 export PYENV_ROOT="$HOME/.pyenv"
7 31 export PATH="$PYENV_ROOT/bin:$PATH"
8 32 eval "$(pyenv init -)"
9 33 autoload -Uz promptinit
10 34 promptinit
11 35 prompt pure