ContextualVersionConflict error on jupyter notebook

[fredjane]

I am running a python code on jupyter notebook and I wanted to import and use the specutils package to plot a doppler-shifted spectrum from my data. This is the part of the code I want to run:

_from astropy.io import ascii
spec1 = ascii.read('NH2CHO_1147_1148.dat') #spectrum data with x = radio velocity [km/s], y = flux [K]
t_mol_s2 = ascii.read('NH2CHO_s1.dat') #Table containing parameters of fitted spectral lines
from specutils import Spectrum1D
print(spec1)
wavelengths = spec1['Velocity']
spectrum = Spectrum1D(spectral_axis=wavelengths, flux=spec1['Flux'])
shift = t_mol_s2['Deltav'][0] #Row in the table containing the shifting quantity for my spectrum
new_spec = Spectrum1D(spectral_axis=spectrum.spectral_axis + shift, flux=spectrum.flux)
print(new_spec)_

and this is the raising error:

_ContextualVersionConflict                 Traceback (most recent call last)
Input In [48], in <cell line: 1>()
----> 1 from specutils import Spectrum1D
      2 print(spec1)
      3 wavelengths = spec1['Velocity']

File /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/specutils/__init__.py:23, in <module>
     19 test.__test__ = False
     22 # Allow loading spectrum object from top level module
---> 23 from .spectra import *  # noqa
     25 # Load the IO functions
     26 from .io.default_loaders import *  # noqa

File /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/specutils/spectra/__init__.py:5, in <module>
      1 """
      2 The core specutils data objects package. This contains the
      3 `~astropy.nddata.NDData`-inherited classes used for storing the spectrum data.
      4 """
----> 5 from .spectrum1d import *  # noqa
      6 from .spectral_region import *  # noqa
      7 from .spectrum_collection import *  # noqa

File /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/specutils/spectra/spectrum1d.py:11, in <module>
      8 from astropy.nddata import NDUncertainty, NDIOMixin, NDArithmeticMixin
     10 from .spectral_axis import SpectralAxis
---> 11 from .spectrum_mixin import OneDSpectrumMixin
     12 from .spectral_region import SpectralRegion
     13 from ..utils.wcs_utils import gwcs_from_array

File /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/specutils/spectra/spectrum_mixin.py:8, in <module>
      5 from astropy import units as u
      6 from astropy.utils.decorators import deprecated
----> 8 from specutils.utils.wcs_utils import gwcs_from_array
     10 DOPPLER_CONVENTIONS = {}
     11 DOPPLER_CONVENTIONS['radio'] = u.doppler_radio

File /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/specutils/utils/wcs_utils.py:7, in <module>
      5 from astropy.modeling.models import Shift
      6 from astropy.modeling.tabular import Tabular1D
----> 7 from gwcs import WCS as GWCS
      8 from gwcs import coordinate_frames as cf
     11 def refraction_index(wavelength, method='Griesen2006', co2=None):

File /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/gwcs/__init__.py:66, in <module>
     63     raise ImportError("GWCS supports Python versions 3.6 and above.")  # pragma: no cover
     65 try:
---> 66     __version__ = get_distribution(__name__).version
     67 except DistributionNotFound:  # pragma: no cover
     68     # package is not installed
     69     pass  # pragma: no cover

File /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py:466, in get_distribution(dist)
    464     dist = Requirement.parse(dist)
    465 if isinstance(dist, Requirement):
--> 466     dist = get_provider(dist)
    467 if not isinstance(dist, Distribution):
    468     raise TypeError("Expected string, Requirement, or Distribution", dist)

File /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py:342, in get_provider(moduleOrReq)
    340 """Return an IResourceProvider for the named module or requirement"""
    341 if isinstance(moduleOrReq, Requirement):
--> 342     return working_set.find(moduleOrReq) or require(str(moduleOrReq))[0]
    343 try:
    344     module = sys.modules[moduleOrReq]

File /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py:886, in WorkingSet.require(self, *requirements)
    877 def require(self, *requirements):
    878     """Ensure that distributions matching `requirements` are activated
    879 
    880     `requirements` must be a string or a (possibly-nested) sequence
   (...)
    884     included, even if they were already activated in this working set.
    885     """
--> 886     needed = self.resolve(parse_requirements(requirements))
    888     for dist in needed:
    889         self.add(dist)

File /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py:777, in WorkingSet.resolve(self, requirements, env, installer, replace_conflicting, extras)
    774 if dist not in req:
    775     # Oops, the "best" so far conflicts with a dependency
    776     dependent_req = required_by[req]
--> 777     raise VersionConflict(dist, req).with_context(dependent_req)
    779 # push the new requirements onto the stack
    780 new_requirements = dist.requires(req.extras)[::-1]

ContextualVersionConflict: (importlib-metadata 4.11.3 (/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages), Requirement.parse('importlib-metadata>=4.11.4'), {'asdf'})_

I am using a MacBook Air (M1, 2020) with macOS Monterey version 12.3.1 and I have installed python 3.9.7, pip 23.1.2, jupyter notebook 6.4.10 and, looking at pip list, specutils 1.11.0, importlib-metadata 4.11.4 and: asdf 2.15.0 asdf-astropy 0.4.0 asdf-coordinates-schemas 0.2.0 asdf-standard 1.0.3 asdf-transform-schemas 0.3.0 asdf-unit-schemas 0.1.0 asdf-wcs-schemas 0.1.1 (given that, if I well interpreted the error message, it's the asdf dependency of both import lib-metadata and specutils to raise it)

Can you help me? Thank you in advance.

[jaraco]

The ContextualVersionConflict is coming from pkg_resources, which is attempting to validate that "importlib_metadata>=4.11.4" is present as required by "asdf", but importlib_metadata is only available at 4.11.3.

You say you have importlib-metadata 4.11.4 installed, but pkg_resources disagrees. You'll need to install importlib_metadata>=4.11.4 to fix the issue.

This report is not a bug with importlib_metadata and there's nothing this project can do to help with the situation. Please reach out on StackOverflow or other user support for Python packaging for help with your environment.