conda-libmamba-solver
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conda
Windows Miniconda installs with broken conda-libmamba-solver [Error while loading conda entry point: conda-libmamba-solver (DLL load failed while importing bindings: The specified module could not be found.) ]
Checklist
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- [x] I searched open reports and couldn't find a duplicate
What happened?
Error while loading conda entry point: conda-libmamba-solver (DLL load failed while importing bindings: The specified module could not be found.)
Conda Info
Error while loading conda entry point: conda-libmamba-solver (DLL load failed while importing bindings: The specified module could not be found.)
(base) C:\Users\tyeth>conda info
Error while loading conda entry point: conda-libmamba-solver (DLL load failed while importing bindings: The specified module could not be found.)
active environment : base
active env location : C:\dev\software\miniconda3
shell level : 1
user config file : C:\Users\tyeth\.condarc
populated config files : C:\dev\software\miniconda3\.condarc
conda version : 25.1.1
conda-build version : not installed
python version : 3.12.9.final.0
solver : libmamba (default)
virtual packages : __archspec=1=skylake
__conda=25.1.1=0
__cuda=12.8=0
__win=10.0.22000=0
base environment : C:\dev\software\miniconda3 (read only)
conda av data dir : C:\dev\software\miniconda3\etc\conda
conda av metadata url : None
channel URLs : https://repo.anaconda.com/pkgs/main/win-64
https://repo.anaconda.com/pkgs/main/noarch
https://repo.anaconda.com/pkgs/r/win-64
https://repo.anaconda.com/pkgs/r/noarch
https://repo.anaconda.com/pkgs/msys2/win-64
https://repo.anaconda.com/pkgs/msys2/noarch
package cache : C:\dev\software\miniconda3\pkgs
C:\Users\tyeth\.conda\pkgs
C:\Users\tyeth\AppData\Local\conda\conda\pkgs
envs directories : C:\Users\tyeth\.conda\envs
C:\dev\software\miniconda3\envs
C:\Users\tyeth\AppData\Local\conda\conda\envs
platform : win-64
user-agent : conda/25.1.1 requests/2.32.3 CPython/3.12.9 Windows/11 Windows/10.0.22000 solver/libmamba aau/0.5.0 c/. s/.
administrator : False
netrc file : None
offline mode : False
Conda Config
(base) C:\Users\tyeth>conda config --show-sources
Error while loading conda entry point: conda-libmamba-solver (DLL load failed while importing bindings: The specified module could not be found.)
==> C:\dev\software\miniconda3\.condarc <==
channels:
- https://repo.anaconda.com/pkgs/main
- https://repo.anaconda.com/pkgs/r
- https://repo.anaconda.com/pkgs/msys2
Conda list
(base) C:\Users\tyeth>conda list --show-channel-urls
Error while loading conda entry point: conda-libmamba-solver (DLL load failed while importing bindings: The specified module could not be found.)
# packages in environment at C:\dev\software\miniconda3:
#
# Name Version Build Channel
anaconda-anon-usage 0.5.0 py312hfc23b7f_100 defaults
anaconda_powershell_prompt 1.1.0 haa95532_0 defaults
anaconda_prompt 1.1.0 haa95532_0 defaults
annotated-types 0.6.0 py312haa95532_0 defaults
archspec 0.2.3 pyhd3eb1b0_0 defaults
boltons 24.1.0 py312haa95532_0 defaults
brotli-python 1.0.9 py312h5da7b33_9 defaults
bzip2 1.0.8 h2bbff1b_6 defaults
ca-certificates 2024.12.31 haa95532_0 defaults
certifi 2025.1.31 py312haa95532_0 defaults
cffi 1.17.1 py312h827c3e9_1 defaults
charset-normalizer 3.3.2 pyhd3eb1b0_0 defaults
colorama 0.4.6 py312haa95532_0 defaults
conda 25.1.1 py312haa95532_0 defaults
conda-anaconda-telemetry 0.1.2 py312haa95532_0 defaults
conda-anaconda-tos 0.1.2 py312haa95532_0 defaults
conda-content-trust 0.2.0 py312haa95532_1 defaults
conda-libmamba-solver 25.1.1 pyhd3eb1b0_0 defaults
conda-package-handling 2.4.0 py312haa95532_0 defaults
conda-package-streaming 0.11.0 py312haa95532_0 defaults
cpp-expected 1.1.0 h214f63a_0 defaults
cryptography 43.0.3 py312hbd6ee87_1 defaults
distro 1.9.0 py312haa95532_0 defaults
expat 2.6.4 h8ddb27b_0 defaults
fmt 9.1.0 h6d14046_1 defaults
frozendict 2.4.2 py312haa95532_0 defaults
idna 3.7 py312haa95532_0 defaults
jsonpatch 1.33 py312haa95532_1 defaults
jsonpointer 2.1 pyhd3eb1b0_0 defaults
libarchive 3.7.7 h9243413_0 defaults
libcurl 8.11.1 haff574d_0 defaults
libffi 3.4.4 hd77b12b_1 defaults
libiconv 1.16 h2bbff1b_3 defaults
libmamba 2.0.5 hcd6fe79_1 defaults
libmambapy 2.0.5 py312h214f63a_1 defaults
libsolv 0.7.30 hf2fb9eb_1 defaults
libssh2 1.11.1 h2addb87_0 defaults
libxml2 2.13.5 h24da03e_0 defaults
lz4-c 1.9.4 h2bbff1b_1 defaults
markdown-it-py 2.2.0 py312haa95532_1 defaults
mdurl 0.1.0 py312haa95532_0 defaults
menuinst 2.2.0 py312h5da7b33_1 defaults
nlohmann_json 3.11.2 h6c2663c_0 defaults
openssl 3.0.15 h827c3e9_0 defaults
packaging 24.2 py312haa95532_0 defaults
pcre2 10.42 h0ff8eda_1 defaults
pip 25.0 py312haa95532_0 defaults
platformdirs 3.10.0 py312haa95532_0 defaults
pluggy 1.5.0 py312haa95532_0 defaults
pybind11-abi 5 hd3eb1b0_0 defaults
pycosat 0.6.6 py312h827c3e9_2 defaults
pycparser 2.21 pyhd3eb1b0_0 defaults
pydantic 2.10.3 py312haa95532_0 defaults
pydantic-core 2.27.1 py312h636fa0f_0 defaults
pygments 2.15.1 py312haa95532_1 defaults
pysocks 1.7.1 py312haa95532_0 defaults
python 3.12.9 h14ffc60_0 defaults
reproc 14.2.4 hd77b12b_2 defaults
reproc-cpp 14.2.4 hd77b12b_2 defaults
requests 2.32.3 py312haa95532_1 defaults
rich 13.9.4 py312haa95532_0 defaults
ruamel.yaml 0.18.6 py312h827c3e9_0 defaults
ruamel.yaml.clib 0.2.8 py312h827c3e9_0 defaults
setuptools 75.8.0 py312haa95532_0 defaults
simdjson 3.10.1 h214f63a_0 defaults
spdlog 1.11.0 h59b6b97_0 defaults
sqlite 3.45.3 h2bbff1b_0 defaults
tk 8.6.14 h0416ee5_0 defaults
tqdm 4.67.1 py312hfc267ef_0 defaults
truststore 0.10.0 py312haa95532_0 defaults
typing-extensions 4.12.2 py312haa95532_0 defaults
typing_extensions 4.12.2 py312haa95532_0 defaults
tzdata 2025a h04d1e81_0 defaults
urllib3 2.3.0 py312haa95532_0 defaults
vc 14.42 haa95532_4 defaults
vs2015_runtime 14.42.34433 he0abc0d_4 defaults
wheel 0.45.1 py312haa95532_0 defaults
win_inet_pton 1.1.0 py312haa95532_0 defaults
xz 5.4.6 h8cc25b3_1 defaults
yaml-cpp 0.8.0 hd77b12b_1 defaults
zlib 1.2.13 h8cc25b3_1 defaults
zstandard 0.23.0 py312h4fc1ca9_1 defaults
zstd 1.5.6 h8880b57_0 defaults
Additional Context
No response
Is this a permissions issue? Notice this line:
C:\dev\software\miniconda3 (read only)
Can you try installing it in a different location where you have permissions? Or give C:\dev\software\miniconda3 write permissions. That said, this might be more of a Miniconda installation problem, rather than a conda-libmamba-solver bug. Let me know what you find out.
@jaimergp No, because I'm getting exactly the same error (also similar setup) but my base environment status is writable.
I didn't change anything (regarding permissions or else) since my latest conda upgrade --all, except my previous conda upgrade --all run a few days ago.
I'm quite sure one of the upgraded packages was related with libmamba...
@tyeth I succeed in working this one around by running conda config --set solver classic, in spite of getting an error when running conda after that although without quitting.
Running conda upgrade --all resulted in libxml2 being downgraded from version 2.14.0 to 2.13.7 and that error is gone, even after setting solver back to libmamba and running conda again.
HOWEVER, with libxml2 version 2.13.7 in place, after setting solver back to libmamba, running conda upgrade --all will result in libxml2 upgrade to version 2.14.0 and after that conda is again broken (the same error shows up).
Re-running conda upgrade --all with classic solver shows no upgrade from libxml2 from version 2.13.7 to 2.14.0, and thus everything keeps working fine.
It really seems something is wrong between conda-libmamba-solver and libxml2 version 2.14.0, that doesn't break classic solver (in spite of it downgrades libxml2 to version 2.13.7).
I think that build of libxml2 2.14 was marked as broken so the faulty upgrade should not happen again.
Ah no, this is still needed: https://github.com/conda-forge/conda-forge-repodata-patches-feedstock/pull/998
In my case, the error message still appears with libxml2==2.13.8, which cannot be fixed by setting conda config --set solver classic:
$ conda list
Error while loading conda entry point: conda-libmamba-solver (DLL load failed while importing bindings: The specified procedure could not be found.)
Error while loading conda entry point: conda-libmamba-solver (DLL load failed while importing bindings: The specified procedure could not be found.)
# packages in environment at C:\Users\Ziyuan\miniforge3:
#
# Name Version Build Channel
archspec 0.2.5 pyhd8ed1ab_0 conda-forge
boltons 24.0.0 pypi_0 pypi
brotli 1.1.0 pypi_0 pypi
bzip2 1.0.8 h2466b09_7 conda-forge
ca-certificates 2025.6.15 h4c7d964_0 conda-forge
certifi 2025.4.26 pypi_0 pypi
cffi 1.17.1 py313ha7868ed_0 conda-forge
charset-normalizer 3.4.2 pyhd8ed1ab_0 conda-forge
colorama 0.4.6 pyhd8ed1ab_1 conda-forge
conda 25.3.0 pypi_0 pypi
conda-libmamba-solver 25.3.0 pypi_0 pypi
conda-package-handling 2.4.0 pyh7900ff3_2 conda-forge
conda-package-streaming 0.11.0 pyhd8ed1ab_1 conda-forge
cpp-expected 1.1.0 hc790b64_1 conda-forge
distro 1.9.0 pyhd8ed1ab_1 conda-forge
fmt 11.1.4 h5f12afc_1 conda-forge
frozendict 2.4.6 py313ha7868ed_0 conda-forge
h2 4.2.0 pyhd8ed1ab_0 conda-forge
hpack 4.1.0 pyhd8ed1ab_0 conda-forge
hyperframe 6.1.0 pyhd8ed1ab_0 conda-forge
idna 3.10 pyhd8ed1ab_1 conda-forge
jsonpatch 1.33 pyhd8ed1ab_1 conda-forge
jsonpointer 3.0.0 py313hfa70ccb_1 conda-forge
krb5 1.21.3 hdf4eb48_0 conda-forge
libarchive 3.8.1 gpl_h1ca5a36_100 conda-forge
libcurl 8.14.1 h88aaa65_0 conda-forge
libexpat 2.7.0 he0c23c2_0 conda-forge
libffi 3.4.6 h537db12_1 conda-forge
libiconv 1.18 h135ad9c_1 conda-forge
liblzma 5.8.1 h2466b09_2 conda-forge
libmamba 2.3.0 hd0d0357_1 conda-forge
libmambapy 2.1.1 pypi_0 pypi
libmpdec 4.0.0 h2466b09_0 conda-forge
libsolv 0.7.33 hbb528cf_0 conda-forge
libsqlite 3.50.2 hf5d6505_0 conda-forge
libssh2 1.11.1 h9aa295b_0 conda-forge
libxml2 2.13.8 h442d1da_0 conda-forge
libzlib 1.3.1 h2466b09_2 conda-forge
lz4-c 1.10.0 h2466b09_1 conda-forge
lzo 2.10 hcfcfb64_1001 conda-forge
mamba 2.3.0 hd7a1ebc_1 conda-forge
menuinst 2.2.0 pypi_0 pypi
miniforge_console_shortcut 2.0 h57928b3_1 conda-forge
nlohmann_json 3.11.3 he0c23c2_1 conda-forge
openssl 3.5.1 h725018a_0 conda-forge
packaging 25.0 pyh29332c3_1 conda-forge
pip 25.1.1 pyh145f28c_0 conda-forge
platformdirs 4.3.8 pyhe01879c_0 conda-forge
pluggy 1.5.0 pypi_0 pypi
pybind11-abi 4 hd8ed1ab_3 conda-forge
pycosat 0.6.6 py313ha7868ed_2 conda-forge
pycparser 2.22 pyh29332c3_1 conda-forge
pysocks 1.7.1 pyh09c184e_7 conda-forge
python 3.13.5 h7de537c_102_cp313 conda-forge
python_abi 3.13 7_cp313 conda-forge
reproc 14.2.5.post0 h2466b09_0 conda-forge
reproc-cpp 14.2.5.post0 he0c23c2_0 conda-forge
requests 2.32.3 pypi_0 pypi
ruamel-yaml 0.18.10 pypi_0 pypi
ruamel.yaml 0.18.14 py313ha7868ed_0 conda-forge
ruamel.yaml.clib 0.2.8 py313ha7868ed_1 conda-forge
setuptools 80.1.0 pypi_0 pypi
simdjson 3.13.0 hc790b64_0 conda-forge
tk 8.6.13 h2c6b04d_2 conda-forge
tqdm 4.67.1 pyhd8ed1ab_1 conda-forge
truststore 0.10.1 pyh29332c3_0 conda-forge
tzdata 2025b h78e105d_0 conda-forge
ucrt 10.0.22621.0 h57928b3_1 conda-forge
urllib3 2.4.0 pypi_0 pypi
vc 14.3 h2b53caa_26 conda-forge
vc14_runtime 14.44.35208 h818238b_26 conda-forge
wheel 0.45.1 pyhd8ed1ab_1 conda-forge
win_inet_pton 1.1.0 pyh7428d3b_8 conda-forge
yaml-cpp 0.8.0 he0c23c2_0 conda-forge
zstandard 0.23.0 pypi_0 pypi
zstd 1.5.7 hbeecb71_2 conda-forge
but mamba list works fine (I noticed mismatches in the channels)
$ mamba list
List of packages in environment: "C:\\Users\\my_name\\miniforge3"
Name Version Build Channel
-----------------------------------------------------------------------------
archspec 0.2.5 pyhd8ed1ab_0 conda-forge
boltons 25.0.0 pyhd8ed1ab_0 conda-forge
bzip2 1.0.8 h2466b09_7 conda-forge
ca-certificates 2025.6.15 h4c7d964_0 conda-forge
certifi 2025.6.15 pyhd8ed1ab_0 conda-forge
cffi 1.17.1 py313ha7868ed_0 conda-forge
charset-normalizer 3.4.2 pyhd8ed1ab_0 conda-forge
colorama 0.4.6 pyhd8ed1ab_1 conda-forge
conda 25.5.1 py313hfa70ccb_0 conda-forge
conda-libmamba-solver 25.4.0 pyhd8ed1ab_0 conda-forge
conda-package-handling 2.4.0 pyh7900ff3_2 conda-forge
conda-package-streaming 0.11.0 pyhd8ed1ab_1 conda-forge
cpp-expected 1.1.0 hc790b64_1 conda-forge
distro 1.9.0 pyhd8ed1ab_1 conda-forge
fmt 11.1.4 h5f12afc_1 conda-forge
frozendict 2.4.6 py313ha7868ed_0 conda-forge
h2 4.2.0 pyhd8ed1ab_0 conda-forge
hpack 4.1.0 pyhd8ed1ab_0 conda-forge
hyperframe 6.1.0 pyhd8ed1ab_0 conda-forge
idna 3.10 pyhd8ed1ab_1 conda-forge
jsonpatch 1.33 pyhd8ed1ab_1 conda-forge
jsonpointer 3.0.0 py313hfa70ccb_1 conda-forge
krb5 1.21.3 hdf4eb48_0 conda-forge
libarchive 3.8.1 gpl_h1ca5a36_100 conda-forge
libcurl 8.14.1 h88aaa65_0 conda-forge
libexpat 2.7.0 he0c23c2_0 conda-forge
libffi 3.4.6 h537db12_1 conda-forge
libiconv 1.18 h135ad9c_1 conda-forge
liblzma 5.8.1 h2466b09_2 conda-forge
libmamba 2.3.0 hd0d0357_1 conda-forge
libmambapy 2.3.0 py313h85c7420_1 conda-forge
libmpdec 4.0.0 h2466b09_0 conda-forge
libsolv 0.7.33 hbb528cf_0 conda-forge
libsqlite 3.50.2 hf5d6505_0 conda-forge
libssh2 1.11.1 h9aa295b_0 conda-forge
libxml2 2.13.8 h442d1da_0 conda-forge
libzlib 1.3.1 h2466b09_2 conda-forge
lz4-c 1.10.0 h2466b09_1 conda-forge
lzo 2.10 hcfcfb64_1001 conda-forge
mamba 2.3.0 hd7a1ebc_1 conda-forge
menuinst 2.3.0 py313hfe59770_0 conda-forge
miniforge_console_shortcut 2.0 h57928b3_1 conda-forge
nlohmann_json 3.11.3 he0c23c2_1 conda-forge
openssl 3.5.1 h725018a_0 conda-forge
packaging 25.0 pyh29332c3_1 conda-forge
pip 25.1.1 pyh145f28c_0 conda-forge
platformdirs 4.3.8 pyhe01879c_0 conda-forge
pluggy 1.6.0 pyhd8ed1ab_0 conda-forge
pybind11-abi 4 hd8ed1ab_3 conda-forge
pycosat 0.6.6 py313ha7868ed_2 conda-forge
pycparser 2.22 pyh29332c3_1 conda-forge
pysocks 1.7.1 pyh09c184e_7 conda-forge
python 3.13.5 h7de537c_102_cp313 conda-forge
python_abi 3.13 7_cp313 conda-forge
reproc 14.2.5.post0 h2466b09_0 conda-forge
reproc-cpp 14.2.5.post0 he0c23c2_0 conda-forge
requests 2.32.4 pyhd8ed1ab_0 conda-forge
ruamel.yaml 0.18.14 py313ha7868ed_0 conda-forge
ruamel.yaml.clib 0.2.8 py313ha7868ed_1 conda-forge
setuptools 80.9.0 pyhff2d567_0 conda-forge
simdjson 3.13.0 hc790b64_0 conda-forge
tk 8.6.13 h2c6b04d_2 conda-forge
tqdm 4.67.1 pyhd8ed1ab_1 conda-forge
truststore 0.10.1 pyh29332c3_0 conda-forge
tzdata 2025b h78e105d_0 conda-forge
ucrt 10.0.22621.0 h57928b3_1 conda-forge
urllib3 2.5.0 pyhd8ed1ab_0 conda-forge
vc 14.3 h2b53caa_26 conda-forge
vc14_runtime 14.44.35208 h818238b_26 conda-forge
wheel 0.45.1 pyhd8ed1ab_1 conda-forge
win_inet_pton 1.1.0 pyh7428d3b_8 conda-forge
yaml-cpp 0.8.0 he0c23c2_0 conda-forge
zstandard 0.23.0 py313ha7868ed_2 conda-forge
zstd 1.5.7 hbeecb71_2 conda-forge
