Hello, Flow that I could run yesterday, is now al of a sudden now working anymore. Seems to happen because of the pypi_base decorator, which to to bootstrap the virtual environment, which is unable to download certain packages. Are more people having this issue, or is just me? I am asking because I haven't changed anything.

from metaflow import FlowSpec, pypi_base, step

@pypi_base(python="3.10")
class LinearFlow(FlowSpec):


    @step
    def start(self):
        self.my_var = 'hello world'
        self.next(self.a)

    @step
    def a(self):
        print('the data artifact is: %s' % self.my_var)
        self.next(self.end)

    @step
    def end(self):
        print('the data artifact is still: %s' % self.my_var)

if __name__ == '__main__':
    LinearFlow()

Validating your flow...
    The graph looks good!
Running pylint...
    Pylint not found, so extra checks are disabled.
Bootstrapping virtual environment(s) ...
    Micromamba ran into an error while setting up environment:
    command '/Users/alper/.metaflowconfig/micromamba/bin/micromamba create --yes --no-deps --download-only --safety-checks=disabled --no-extra-safety-checks --repodata-ttl=86400 --prefix=/var/folders/my/bv04f6xs1cx1kw73h2ng99mw0000gn/T/tmpko0_hlpd/prefix --quiet <https://conda.anaconda.org/conda-forge/noarch/tzdata-2023c-h71feb2d_0.conda> <https://conda.anaconda.org/conda-forge/osx-64/bzip2-1.0.8-h10d778d_5.conda> <https://conda.anaconda.org/conda-forge/osx-64/libffi-3.4.2-h0d85af4_5.tar.bz2> <https://conda.anaconda.org/conda-forge/osx-64/libzlib-1.2.13-h8a1eda9_5.conda> <https://conda.anaconda.org/conda-forge/osx-64/ncurses-6.4-h93d8f39_2.conda> <https://conda.anaconda.org/conda-forge/osx-64/xz-5.2.6-h775f41a_0.tar.bz2> <https://conda.anaconda.org/conda-forge/osx-64/ca-certificates-2023.11.17-h8857fd0_0.conda> <https://conda.anaconda.org/conda-forge/osx-64/tk-8.6.13-h1abcd95_1.conda> <https://conda.anaconda.org/conda-forge/osx-64/libsqlite-3.44.2-h92b6c6a_0.conda> <https://conda.anaconda.org/conda-forge/osx-64/readline-8.2-h9e318b2_1.conda> <https://conda.anaconda.org/conda-forge/osx-64/openssl-3.2.0-hd75f5a5_1.conda> <https://conda.anaconda.org/conda-forge/osx-64/sqlite-3.44.2-h7461747_0.conda> <https://conda.anaconda.org/conda-forge/osx-64/python-3.10.0-h38b4d05_3_cpython.tar.bz2> <https://conda.anaconda.org/conda-forge/noarch/wheel-0.42.0-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/setuptools-68.2.2-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/pip-23.3.2-pyhd8ed1ab_0.conda>' returned error (1)
    critical libmamba The package "<https://conda.anaconda.org/conda-forge/noarch/tzdata-2023c-h71feb2d_0.conda::tzdata==2023c=h71feb2d_0>" is not found in any loaded channels. Try adding more channels or subdirs.

I'm having a similar issue

Bootstrapping virtual environment(s) ...
    Micromamba ran into an error while setting up environment:
    command '/root/.metaflowconfig/micromamba/bin/micromamba create --yes --no-deps --download-only --safety-checks=disabled --no-extra-safety-checks --repodata-ttl=86400 --prefix=/tmp/tmpmqil3qww/prefix --quiet <https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2> <https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.40-h41732ed_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-ng-13.2.0-h7e041cc_3.conda> <https://conda.anaconda.org/conda-forge/linux-64/python_abi-3.10-4_cp310.conda> <https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2023.11.17-hbcca054_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/libgomp-13.2.0-h807b86a_3.conda> <https://conda.anaconda.org/conda-forge/linux-64/_openmp_mutex-4.5-2_gnu.tar.bz2> <https://conda.anaconda.org/conda-forge/linux-64/libgcc-ng-13.2.0-h807b86a_3.conda> <https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.24.0-hd590300_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/openssl-3.2.0-hd590300_1.conda> <https://conda.anaconda.org/conda-forge/linux-64/libzlib-1.2.13-hd590300_5.conda> <https://conda.anaconda.org/conda-forge/linux-64/libffi-3.4.2-h7f98852_5.tar.bz2> <https://conda.anaconda.org/conda-forge/linux-64/bzip2-1.0.8-hd590300_5.conda> <https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.4-h59595ed_2.conda> <https://conda.anaconda.org/conda-forge/linux-64/libabseil-20230802.1-cxx17_h59595ed_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/libcrc32c-1.1.2-h9c3ff4c_0.tar.bz2> <https://conda.anaconda.org/conda-forge/linux-64/libuuid-2.38.1-h0b41bf4_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/libnsl-2.0.1-hd590300_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/xz-5.2.6-h166bdaf_0.tar.bz2> <https://conda.anaconda.org/conda-forge/linux-64/tk-8.6.13-noxft_h4845f30_101.conda> <https://conda.anaconda.org/conda-forge/linux-64/libsqlite-3.44.2-h2797004_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/readline-8.2-h8228510_1.conda> <https://conda.anaconda.org/conda-forge/linux-64/libre2-11-2023.06.02-h7a70373_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/libprotobuf-4.24.4-hf27288f_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/re2-2023.06.02-h2873b5e_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/libgrpc-1.60.0-hd6c4280_0.conda> <https://conda.anaconda.org/conda-forge/noarch/tzdata-2023c-h71feb2d_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/python-3.10.13-hd12c33a_0_cpython.conda> <https://conda.anaconda.org/conda-forge/noarch/wheel-0.42.0-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/setuptools-68.2.2-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/pip-23.3.2-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/typing_extensions-4.9.0-pyha770c72_0.conda> <https://conda.anaconda.org/conda-forge/noarch/pysocks-1.7.1-pyha2e5f31_6.tar.bz2> <https://conda.anaconda.org/conda-forge/noarch/attrs-23.1.0-pyh71513ae_1.conda> <https://conda.anaconda.org/conda-forge/noarch/pycparser-2.21-pyhd8ed1ab_0.tar.bz2> <https://conda.anaconda.org/conda-forge/noarch/six-1.16.0-pyh6c4a22f_0.tar.bz2> <https://conda.anaconda.org/conda-forge/noarch/pyasn1-0.5.1-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/cachetools-5.3.2-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.3.2-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/idna-3.6-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/certifi-2023.11.17-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/typing-extensions-4.9.0-hd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/pyu2f-0.1.5-pyhd8ed1ab_0.tar.bz2> <https://conda.anaconda.org/conda-forge/noarch/pyasn1-modules-0.3.0-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/rsa-4.9-pyhd8ed1ab_0.tar.bz2> <https://conda.anaconda.org/conda-forge/noarch/async-timeout-4.0.3-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/brotli-python-1.1.0-py310hc6cd4ac_1.conda> <https://conda.anaconda.org/conda-forge/linux-64/multidict-6.0.4-py310h2372a71_1.conda> <https://conda.anaconda.org/conda-forge/linux-64/frozenlist-1.4.1-py310h2372a71_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/grpcio-1.60.0-py310h1b8f574_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/protobuf-4.24.4-py310h620c231_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/cffi-1.16.0-py310h2fee648_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/yarl-1.9.3-py310h2372a71_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/cryptography-41.0.7-py310hb8475ec_1.conda> <https://conda.anaconda.org/conda-forge/linux-64/google-crc32c-1.1.2-py310hc5c09a0_5.conda> <https://conda.anaconda.org/conda-forge/noarch/urllib3-2.1.0-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/aiosignal-1.3.1-pyhd8ed1ab_0.tar.bz2> <https://conda.anaconda.org/conda-forge/noarch/googleapis-common-protos-1.62.0-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/pyopenssl-23.3.0-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/google-resumable-media-2.7.0-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/requests-2.31.0-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/linux-64/aiohttp-3.9.1-py310h2372a71_0.conda> <https://conda.anaconda.org/conda-forge/noarch/google-auth-2.25.2-pyhca7485f_0.conda> <https://conda.anaconda.org/conda-forge/noarch/google-api-core-2.15.0-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/google-cloud-core-2.4.1-pyhd8ed1ab_0.conda> <https://conda.anaconda.org/conda-forge/noarch/google-cloud-storage-2.14.0-pyhca7485f_0.conda>' returned error (1)
    critical libmamba The package "<https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2::_libgcc_mutex==0.1=conda_forge>" is not found in any loaded channels. Try adding more channels or subdirs.

I fixed this by downgrading Micromamba / installing an older Micromamba version separately, e.g.

curl -Ls <https://micro.mamba.pm/api/micromamba/linux-64/1.5.1> | tar -xvj bin/micromamba

in your working directory Not sure what changed in Micromamba since yesterday, their releases page still shows 1.5.5 as the latest version but the one Metaflow automatically downloads in a fresh environment is 2.0.0

also seeing this

Downgrading mamba works @fancy-chef-63734

now https://micro.mamba.pm/api/micromamba/linux-64/latest points to 1.5.5 again