Mamba throws `ImportError: DLL load failed..." on a fresh install.

[simonrp84]

Troubleshooting docs

• My problem is not solved in the Troubleshooting docs

How did you install Mamba?

Mambaforge

Search tried in issue tracker

Yes

Latest version of Mamba

• My problem is not solved with the latest version

Tried in Conda?

Not applicable

Describe your issue

I installed mamba via the windows mambaforge package and this was successful. I then ran mamba update --all and this was also successful.

But, when I try to install a package after this (let's say mamba install numpy) I get:

(base) C:\Users\Simon>mamba install numpy
Traceback (most recent call last):
  File "C:\Users\Simon\mambaforge\Scripts\mamba-script.py", line 6, in <module>
    from mamba.mamba import main
  File "C:\Users\Simon\mambaforge\lib\site-packages\mamba\mamba.py", line 49, in <module>
    import libmambapy as api
  File "C:\Users\Simon\mambaforge\lib\site-packages\libmambapy\__init__.py", line 7, in <module>
    raise e
  File "C:\Users\Simon\mambaforge\lib\site-packages\libmambapy\__init__.py", line 4, in <module>
    from libmambapy.bindings import *  # noqa: F401,F403
ImportError: DLL load failed while importing bindings: The specified module could not be found.

I have also tried with a fresh miniconda install followed by conda install mamba then mamba install numpy and I see the same issue.

mamba info / micromamba info

I cannot post the results of this as the `mamba info` command throws `ImportError`

Logs

Same error message as posted above.

environment.yml

N/A, this is a `base` environment in a fresh install.

~/.condarc

channels:
  - conda-forge
  - defaults
channel_priority: strict
verbosity: 0
solver: classic

[simonrp84]

Small update, having looked into this a bit more it seems the problem is coming from libsolv, which is being changed from libsolv=0.7.24=h12be248_1 to libsolv=0.7.24=h12be248_2:

• If I update libsolv alone then I get the above error.
• If I pin libsolv=0.7.24=h12be248_1 then I can run mamba update --all on the other packages (libmamba, wheel, etc) without any problem.

[jonashaag]

Can you please show the logs of the update so that we can see what packages were updated

[simonrp84]

Sorry, should've thought of that.
Doing mamba update --all --dry-run on a fresh install shows:

conda-forge/win-64                                          Using cache
conda-forge/noarch                                          Using cache
pkgs/msys2/win-64                                             No change
pkgs/main/noarch                                              No change
pkgs/main/win-64                                              No change
pkgs/r/win-64                                                 No change
pkgs/msys2/noarch                                             No change
pkgs/r/noarch                                                 No change

Pinned packages:
  - python 3.10.*


Transaction

  Prefix: C:\Users\Simon\mambaforge2

  Updating specs:

   - boltons
   - brotli-python
   - bzip2
   - ca-certificates
   - certifi
   - cffi
   - charset-normalizer
   - colorama
   - conda
   - conda-libmamba-solver
   - conda-package-handling
   - conda-package-streaming
   - cryptography
   - fmt
   - idna
   - jsonpatch
   - jsonpointer
   - krb5
   - libarchive
   - libcurl
   - libffi
   - libiconv
   - libmamba
   - libmambapy
   - libsolv
   - libsqlite
   - libssh2
   - libxml2
   - libzlib
   - lz4-c
   - lzo
   - mamba
   - menuinst
   - miniforge_console_shortcut
   - openssl
   - packaging
   - pip
   - pluggy
   - pybind11-abi
   - pycosat
   - pycparser
   - pyopenssl
   - pysocks
   - python
   - python_abi
   - reproc
   - reproc-cpp
   - requests
   - ruamel.yaml
   - ruamel.yaml.clib
   - setuptools
   - tk
   - toolz
   - tqdm
   - tzdata
   - ucrt
   - urllib3
   - vc
   - vc14_runtime
   - vs2015_runtime
   - wheel
   - win_inet_pton
   - xz
   - yaml-cpp
   - zstandard
   - zstd
   - ca-certificates
   - certifi
   - openssl


  Package                       Version  Build            Channel                 Size
----------------------------------------------------------------------------------------
  Change:
----------------------------------------------------------------------------------------

  - libsolv                      0.7.24  h12be248_1       conda-forge
  + libsolv                      0.7.24  h12be248_2       conda-forge/win-64     750kB

  Upgrade:
----------------------------------------------------------------------------------------

  - conda                        23.3.1  py310h5588dad_0  conda-forge
  + conda                        23.7.2  py310h5588dad_0  conda-forge/win-64       1MB
  - conda-libmamba-solver        23.3.0  pyhd8ed1ab_0     conda-forge
  + conda-libmamba-solver        23.7.0  pyhd8ed1ab_0     conda-forge/noarch      42kB
  - libmamba                      1.4.2  h8a7d157_0       conda-forge
  + libmamba                      1.4.9  ha24f096_0       conda-forge/win-64       3MB
  - libmambapy                    1.4.2  py310h3fe4c2e_0  conda-forge
  + libmambapy                    1.4.9  py310h3fe4c2e_0  conda-forge/win-64     454kB
  - mamba                         1.4.2  py310hd9d798f_0  conda-forge
  + mamba                         1.4.9  py310hd9d798f_0  conda-forge/win-64      68kB
  - miniforge_console_shortcut      1.0  h57928b3_0       conda-forge
  + miniforge_console_shortcut      2.0  h57928b3_1       conda-forge/win-64      16kB
  - wheel                        0.41.1  pyhd8ed1ab_0     conda-forge
  + wheel                        0.41.2  pyhd8ed1ab_0     conda-forge/noarch      57kB

  Summary:

  Change: 1 packages
  Upgrade: 7 packages

  Total download: 6MB

----------------------------------------------------------------------------------------

Doing mamba update libsolv (i.e: Only the troublesome package) shows:

Looking for: ['libsolv']

pkgs/r/win-64                                      742.8kB @ 767.8kB/s  1.0s
pkgs/main/noarch                                   852.1kB @ 834.4kB/s  1.1s
pkgs/msys2/noarch                                  111.0 B @  98.0 B/s  0.1s
pkgs/msys2/win-64                                   39.8kB @  32.2kB/s  0.1s
pkgs/r/noarch                                        1.3MB @ 503.7kB/s  1.6s
pkgs/main/win-64                                     5.3MB @   1.0MB/s  5.4s
conda-forge/noarch                                  13.8MB @   1.4MB/s 10.9s
conda-forge/win-64                                  21.7MB @   1.8MB/s 13.1s

Pinned packages:
  - python 3.10.*


Transaction

  Prefix: C:\Users\Simon\mambaforge2

  Updating specs:

   - libsolv
   - ca-certificates
   - certifi
   - openssl


  Package    Version  Build       Channel                 Size
----------------------------------------------------------------
  Change:
----------------------------------------------------------------

  - libsolv   0.7.24  h12be248_1  conda-forge
  + libsolv   0.7.24  h12be248_2  conda-forge/win-64     750kB

  Summary:

  Change: 1 packages

  Total download: 750kB

----------------------------------------------------------------

[jonashaag]

Did you read this?

Did you perform a search with your error message?

[simonrp84]

Yes.

[jonashaag]

I'm pretty sure it's a dupe of #1728. Closing as such.

[jonashaag]

While the symptoms are the same, I actually don't think it's the same problem as #1728. Sorry for prematurely closing this issue.

In any case you should not have checked the troubleshooting checkbox while still using the default channels, @simonrp84.

[jonashaag]

This should be fixed by the latest libsolv build