# PyCall build fails during Conda installation on Win 11

**URL:** <https://discourse.julialang.org/t/pycall-build-fails-during-conda-installation-on-win-11/101786>\
**Category:** General Usage\
**Created:** [July 19, 2023, 3:01pm UTC](https://discourse.julialang.org/t/pycall-build-fails-during-conda-installation-on-win-11/101786 "2023-07-19T15:01:31Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Disperser3804](https://avatars.discourse-cdn.com/v4/letter/d/91b2a8/32.png) [@Disperser3804](https://discourse.julialang.org/u/Disperser3804)\
**Post date:** [July 19, 2023, 3:01pm UTC](https://discourse.julialang.org/t/pycall-build-fails-during-conda-installation-on-win-11/101786/1 "2023-07-19T15:01:31Z")

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On a fresh Win 11 and Julia 1.9.2 installation, building PyCall results in an error during the miniconda installation step:

```julia
ERROR: Error building PyCall:
┌ Info: Using the Python distribution in the Conda package by default.
└ To use a different Python version, set ENV["PYTHON"]="pythoncommand" and re-run Pkg.build("PyCall").
[ Info: Downloading miniconda installer ...
[ Info: Installing miniconda ...
ERROR: LoadError: failed process: Process('C:\Users\Ron\AppData\Local\Temp\installer.exe' /S --no-shortcuts /NoRegistry=1 /AddToPath=0 /RegisterPython=0 '/D=C:\Users\Ron\.julia\conda\3', ProcessExited(2)) [2]

```

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<div class="post-metadata">

**Author:** ![Disperser3804](https://avatars.discourse-cdn.com/v4/letter/d/91b2a8/32.png) [@Disperser3804](https://discourse.julialang.org/u/Disperser3804)\
**Post date:** [July 19, 2023, 3:04pm UTC](https://discourse.julialang.org/t/pycall-build-fails-during-conda-installation-on-win-11/101786/2 "2023-07-19T15:04:19Z")

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The reason for the error was that for some reason the miniconda installer.exe is copied into the destination folder ( `/D=C:\Users\Ron\.julia\conda\3`). Deleting it from there, and running the command line (`C:\Users\Ron\AppData\Local\Temp\installer.exe /S --no-shortcuts /NoRegistry=1 /AddToPath=0/RegisterPython=0 /D=C:\Users\Ron\.julia\conda\3` from powershell installed conda, after which building PyCall works fine.

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**Author:** ![mkitti](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mkitti/32/12459_2.png) [@mkitti](https://discourse.julialang.org/u/mkitti)\
**Post date:** [July 19, 2023, 4:11pm UTC](https://discourse.julialang.org/t/pycall-build-fails-during-conda-installation-on-win-11/101786/3 "2023-07-19T16:11:55Z")

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Thanks for writing this up! I’m seeing a similar report here:

> **[reticulate::install\_miniconda(force = TRUE) fails with exit code = 2 on...](https://community.rstudio.com/t/reticulate-install-miniconda-force-true-fails-with-exit-code-2-on-windows-11/168206)**
>
> the installation of reticulate::install\_miniconda(force = TRUE) failed I stepped inside the function and followed it to reticulate:::miniconda\_installer\_run() where it then fails at if (is\_windows()) { installer \<-...