# When import yaml file, PackagesNotFoundError

**URL:** <https://forum.anaconda.com/t/when-import-yaml-file-packagesnotfounderror/108001>\
**Category:** Product Help\
**Created:** [December 7, 2025, 4:19am UTC](https://forum.anaconda.com/t/when-import-yaml-file-packagesnotfounderror/108001 "2025-12-07T04:19:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Jacky](https://avatars.discourse-cdn.com/v4/letter/j/00a5b5/32.png) [@Jacky](https://forum.anaconda.com/u/Jacky)\
**Post date:** [December 7, 2025, 4:19am UTC](https://forum.anaconda.com/t/when-import-yaml-file-packagesnotfounderror/108001/1 "2025-12-07T04:19:00Z")

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PackagesNotFoundError: The following packages are not available from current channels:

- ca-certificates==2020.1.1=0

Current channels:

- [main](https://repo.anaconda.com/pkgs/main)
- [https://repo.anaconda.com/pkgs/r](https://repo.anaconda.com/pkgs/r)

how can I find this packages? thinks

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<div class="post-metadata">

**Author:** ![Tyler\_F\_Anaconda](https://dub1.discourse-cdn.com/anaconda/user_avatar/forum.anaconda.com/tyler_f_anaconda/32/6666_2.png) [@Tyler\_F\_Anaconda](https://forum.anaconda.com/u/Tyler_F_Anaconda)\
**Post date:** [December 7, 2025, 10:22pm UTC](https://forum.anaconda.com/t/when-import-yaml-file-packagesnotfounderror/108001/2 "2025-12-07T22:22:03Z")

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Hello Jacky,

What kind of machine are you using? It looks like the main channel has this package for a few subdirectories: [Anaconda.org](https://anaconda.org/channels/main/packages/ca-certificates/files?name=2020.1.1)

Maybe you’re on an Apple Silicon Mac? There is not a build for osx-arm64 (which equates to the Apple Silicon machines) on the main channel. Anaconda began distributing packages for osx-arm64 a few years after the package version you are looking for was released.

I dont see this version of ca-certificates on conda-forge at all.

Why do you need to use such an old version of the ca-certificates package?