Unicode error on windows when creating environment with package sphinx-automodapi #4054
Description
Troubleshooting docs
- My problem is not solved in the Troubleshooting docs
Anaconda default channels
- I do NOT use the Anaconda default channels (pkgs/* etc.)
How did you install Mamba?
Micromamba
Search tried in issue tracker
Similar but different issue closed in 2024: #3228
Latest version of Mamba
- My problem is not solved with the latest version
Tried in Conda?
I do not have this problem with Conda, just with Mamba
Describe your issue
Creating a new environment that contains the package sphinx-automodapi from conda forge fails on windows with an encoding / unicode error:
PS C:\Users\MaximilianLinhoff\micromamba-test> .\micromamba.exe create -p .\test-env python=3.12 sphinx-automodapi
conda-forge/noarch Using cache
conda-forge/win-64 Using cache
Transaction
Prefix: test-env
Updating specs:
- python=3.12
- sphinx-automodapi
Package Version Build Channel Size
---------------------------------------------------------------------------------------------
Install:
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+ alabaster 1.0.0 pyhd8ed1ab_1 conda-forge Cached
+ babel 2.17.0 pyhd8ed1ab_0 conda-forge Cached
+ brotli-python 1.1.0 py312h275cf98_3 conda-forge Cached
+ bzip2 1.0.8 h2466b09_7 conda-forge Cached
+ ca-certificates 2025.8.3 h4c7d964_0 conda-forge Cached
+ certifi 2025.8.3 pyhd8ed1ab_0 conda-forge Cached
+ cffi 1.17.1 py312h4389bb4_0 conda-forge Cached
+ charset-normalizer 3.4.3 pyhd8ed1ab_0 conda-forge Cached
+ colorama 0.4.6 pyhd8ed1ab_1 conda-forge Cached
+ docutils 0.21.2 pyhd8ed1ab_1 conda-forge Cached
+ h2 4.2.0 pyhd8ed1ab_0 conda-forge Cached
+ hpack 4.1.0 pyhd8ed1ab_0 conda-forge Cached
+ hyperframe 6.1.0 pyhd8ed1ab_0 conda-forge Cached
+ idna 3.10 pyhd8ed1ab_1 conda-forge Cached
+ imagesize 1.4.1 pyhd8ed1ab_0 conda-forge Cached
+ jinja2 3.1.6 pyhd8ed1ab_0 conda-forge Cached
+ libexpat 2.7.1 hac47afa_0 conda-forge Cached
+ libffi 3.4.6 h537db12_1 conda-forge Cached
+ liblzma 5.8.1 h2466b09_2 conda-forge Cached
+ libsqlite 3.50.4 hf5d6505_0 conda-forge Cached
+ libzlib 1.3.1 h2466b09_2 conda-forge Cached
+ markupsafe 3.0.2 py312h31fea79_1 conda-forge Cached
+ openssl 3.5.2 h725018a_0 conda-forge Cached
+ packaging 25.0 pyh29332c3_1 conda-forge Cached
+ pip 25.2 pyh8b19718_0 conda-forge Cached
+ pycparser 2.22 pyh29332c3_1 conda-forge Cached
+ pygments 2.19.2 pyhd8ed1ab_0 conda-forge Cached
+ pysocks 1.7.1 pyh09c184e_7 conda-forge Cached
+ python 3.12.11 h3f84c4b_0_cpython conda-forge Cached
+ python_abi 3.12 8_cp312 conda-forge Cached
+ pytz 2025.2 pyhd8ed1ab_0 conda-forge Cached
+ requests 2.32.5 pyhd8ed1ab_0 conda-forge Cached
+ roman-numerals-py 3.1.0 pyhd8ed1ab_0 conda-forge Cached
+ setuptools 80.9.0 pyhff2d567_0 conda-forge Cached
+ snowballstemmer 3.0.1 pyhd8ed1ab_0 conda-forge Cached
+ sphinx 8.3.0 pyhd8ed1ab_0 conda-forge Cached
+ sphinx-automodapi 0.20.0 pyhbacfb6d_0 conda-forge Cached
+ sphinxcontrib-applehelp 2.0.0 pyhd8ed1ab_1 conda-forge Cached
+ sphinxcontrib-devhelp 2.0.0 pyhd8ed1ab_1 conda-forge Cached
+ sphinxcontrib-htmlhelp 2.1.0 pyhd8ed1ab_1 conda-forge Cached
+ sphinxcontrib-jsmath 1.0.1 pyhd8ed1ab_1 conda-forge Cached
+ sphinxcontrib-qthelp 2.0.0 pyhd8ed1ab_1 conda-forge Cached
+ sphinxcontrib-serializinghtml 1.1.10 pyhd8ed1ab_1 conda-forge Cached
+ tk 8.6.13 h2c6b04d_2 conda-forge Cached
+ tzdata 2025b h78e105d_0 conda-forge Cached
+ ucrt 10.0.22621.0 h57928b3_1 conda-forge Cached
+ urllib3 2.5.0 pyhd8ed1ab_0 conda-forge Cached
+ vc 14.3 h41ae7f8_31 conda-forge Cached
+ vc14_runtime 14.44.35208 h818238b_31 conda-forge Cached
+ vcomp14 14.44.35208 h818238b_31 conda-forge Cached
+ wheel 0.45.1 pyhd8ed1ab_1 conda-forge Cached
+ win_inet_pton 1.1.0 pyh7428d3b_8 conda-forge Cached
+ zstandard 0.23.0 py312he06e257_3 conda-forge Cached
Summary:
Install: 53 packages
Total download: 0 B
---------------------------------------------------------------------------------------------
Confirm changes: [Y/n] y
Transaction starting
Linking tzdata-2025b-h78e105d_0
Linking ca-certificates-2025.8.3-h4c7d964_0
Linking python_abi-3.12-8_cp312
Linking ucrt-10.0.22621.0-h57928b3_1
Linking vcomp14-14.44.35208-h818238b_31
Linking vc14_runtime-14.44.35208-h818238b_31
Linking vc-14.3-h41ae7f8_31
Linking tk-8.6.13-h2c6b04d_2
Linking openssl-3.5.2-h725018a_0
Linking libzlib-1.3.1-h2466b09_2
Linking libsqlite-3.50.4-hf5d6505_0
Linking liblzma-5.8.1-h2466b09_2
Linking libffi-3.4.6-h537db12_1
Linking libexpat-2.7.1-hac47afa_0
Linking bzip2-1.0.8-h2466b09_7
Linking python-3.12.11-h3f84c4b_0_cpython
Linking wheel-0.45.1-pyhd8ed1ab_1
Linking setuptools-80.9.0-pyhff2d567_0
Linking pip-25.2-pyh8b19718_0
Linking pycparser-2.22-pyh29332c3_1
Linking win_inet_pton-1.1.0-pyh7428d3b_8
Linking hyperframe-6.1.0-pyhd8ed1ab_0
Linking hpack-4.1.0-pyhd8ed1ab_0
Linking pytz-2025.2-pyhd8ed1ab_0
Linking idna-3.10-pyhd8ed1ab_1
Linking charset-normalizer-3.4.3-pyhd8ed1ab_0
Linking certifi-2025.8.3-pyhd8ed1ab_0
Linking imagesize-1.4.1-pyhd8ed1ab_0
Linking sphinxcontrib-jsmath-1.0.1-pyhd8ed1ab_1
Linking snowballstemmer-3.0.1-pyhd8ed1ab_0
Linking roman-numerals-py-3.1.0-pyhd8ed1ab_0
Linking pygments-2.19.2-pyhd8ed1ab_0
Linking packaging-25.0-pyh29332c3_1
Linking docutils-0.21.2-pyhd8ed1ab_1
Linking colorama-0.4.6-pyhd8ed1ab_1
Linking alabaster-1.0.0-pyhd8ed1ab_1
Linking pysocks-1.7.1-pyh09c184e_7
Linking h2-4.2.0-pyhd8ed1ab_0
Linking babel-2.17.0-pyhd8ed1ab_0
Linking brotli-python-1.1.0-py312h275cf98_3
Linking markupsafe-3.0.2-py312h31fea79_1
Linking cffi-1.17.1-py312h4389bb4_0
Linking zstandard-0.23.0-py312he06e257_3
Linking jinja2-3.1.6-pyhd8ed1ab_0
Linking urllib3-2.5.0-pyhd8ed1ab_0
Linking requests-2.32.5-pyhd8ed1ab_0
Linking sphinx-8.3.0-pyhd8ed1ab_0
Linking sphinxcontrib-applehelp-2.0.0-pyhd8ed1ab_1
Linking sphinxcontrib-devhelp-2.0.0-pyhd8ed1ab_1
Linking sphinxcontrib-htmlhelp-2.1.0-pyhd8ed1ab_1
Linking sphinxcontrib-qthelp-2.0.0-pyhd8ed1ab_1
Linking sphinxcontrib-serializinghtml-1.1.10-pyhd8ed1ab_1
Linking sphinx-automodapi-0.20.0-pyhbacfb6d_0
critical libmamba No mapping for the Unicode character exists in the target multi-byte code page.
Also see: mamba-org/setup-micromamba#280
mamba info / micromamba info
PS C:\Users\MaximilianLinhoff\micromamba-test> .\micromamba.exe info
libmamba version : 2.3.2
micromamba version : 2.3.2
curl version : libcurl/8.15.0-DEV Schannel zlib/1.3.1
libarchive version : libarchive 3.8.1 zlib/1.3.1 liblzma/5.8.1 bz2lib/1.0.8 liblz4/1.10.0 libzstd/1.5.7 liblzo2/2.d
envs directories : C:\Users\MaximilianLinhoff\AppData\Roaming\mamba\envs
package cache : C:\Users\MaximilianLinhoff\AppData\Roaming\mamba\pkgs
C:\Users\MaximilianLinhoff\.mamba\pkgs
C:\Users\MaximilianLinhoff\AppData\Roaming\.mamba\pkgs
environment : base
env location : C:\Users\MaximilianLinhoff\AppData\Roaming\mamba
user config files : C:\Users\MaximilianLinhoff\.mambarc
populated config files :
virtual packages : __win=10.0.26100=0
__archspec=1=x86_64_v3
channels : https://conda.anaconda.org/conda-forge/noarch
https://conda.anaconda.org/conda-forge/win-64
base environment : C:\Users\MaximilianLinhoff\AppData\Roaming\mamba
platform : win-64