警告：远程服务器找不到所请求通道的noarch目录

Question

当我尝试安装软件包时，我看到来自conda的奇怪错误。仅仅搜索包裹会产生如下奇怪的警告。发生了什么事？

(base) $ conda search libdvid-cpp
Fetching package metadata ....
WARNING: The remote server could not find the noarch directory for the
requested channel with url: https://conda.anaconda.org/flyem-forge

It is possible you have given conda an invalid channel. Please double-check
your conda configuration using `conda config --show`.

If the requested url is in fact a valid conda channel, please request that the
channel administrator create `noarch/repodata.json` and associated
`noarch/repodata.json.bz2` files, even if `noarch/repodata.json` is empty.
$ mkdir noarch
$ echo '{}' > noarch/repodata.json
$ bzip2 -k noarch/repodata.json
..
WARNING: The remote server could not find the noarch directory for the
requested channel with url: https://conda.anaconda.org/conda-forge

It is possible you have given conda an invalid channel. Please double-check
your conda configuration using `conda config --show`.

If the requested url is in fact a valid conda channel, please request that the
channel administrator create `noarch/repodata.json` and associated
`noarch/repodata.json.bz2` files, even if `noarch/repodata.json` is empty.
$ mkdir noarch
$ echo '{}' > noarch/repodata.json
$ bzip2 -k noarch/repodata.json
.........

PackageNotFoundError: Packages missing in current channels:

 - [('libdvid-cpp',)]

We have searched for the packages in the following channels:

 - https://conda.anaconda.org/flyem-forge/osx-64
 - https://conda.anaconda.org/flyem-forge/noarch
 - https://conda.anaconda.org/conda-forge/osx-64
 - https://conda.anaconda.org/conda-forge/noarch
 - https://repo.continuum.io/pkgs/main/osx-64
 - https://repo.continuum.io/pkgs/main/noarch
 - https://repo.continuum.io/pkgs/free/osx-64
 - https://repo.continuum.io/pkgs/free/noarch
 - https://repo.continuum.io/pkgs/r/osx-64
 - https://repo.continuum.io/pkgs/r/noarch
 - https://repo.continuum.io/pkgs/pro/osx-64
 - https://repo.continuum.io/pkgs/pro/noarch

Answer 1

Conda在阅读远程软件包存储库时遇到问题。以下是一些尝试：

仔细检查您的频道列表

签入~/.condarc或.../miniconda/.condarc。或使用以下命令查看配置文件的位置：

conda config --show-sources

确保所有通道名称拼写正确。

尝试刷新anaconda.org

的令牌

anaconda logout
anaconda login

（如果您没有安装anaconda命令，则此问题不适用于您。）

尝试刷新DNS缓存：

在Mac上：

sudo killall -HUP mDNSResponder

在Linux上，您的DNS条目可能根本没有缓存，但请参见此处：

• https://unix.stackexchange.com/questions/67592/how-to-flush-local-dns-cache-in-centos
• https://askubuntu.com/questions/2219/how-do-i-clear-the-dns-cache