InvalidVersion                            Traceback (most recent call last)
Cell In[1], line 3
      1 import discretisedfield as df
      2 import micromagneticmodel as mm
----> 3 import mumax3c as mc
      4 #import oommfc as oc
      5 import math

File ~\anaconda3\envs\ubermag_env\lib\site-packages\mumax3c\__init__.py:60
     54     return pytest.main(
     55         ["-m", "docker", "-v", "--pyargs", "mumax3c"]
     56     )  # pragma: no cover
     59 __version__ = pkg_resources.get_distribution(__name__).version
---> 60 __dependencies__ = pkg_resources.require(__name__)

File ~\anaconda3\envs\ubermag_env\lib\site-packages\pkg_resources\__init__.py:966, in WorkingSet.require(self, *requirements)
    957 def require(self, *requirements):
    958     """Ensure that distributions matching `requirements` are activated
    959 
    960     `requirements` must be a string or a (possibly-nested) sequence
   (...)
    964     included, even if they were already activated in this working set.
    965     """
--> 966     needed = self.resolve(parse_requirements(requirements))
    968     for dist in needed:
    969         self.add(dist)

File ~\anaconda3\envs\ubermag_env\lib\site-packages\pkg_resources\__init__.py:827, in WorkingSet.resolve(self, requirements, env, installer, replace_conflicting, extras)
    824 if not req_extras.markers_pass(req, extras):
    825     continue
--> 827 dist = self._resolve_dist(
    828     req, best, replace_conflicting, env, installer, required_by, to_activate
    829 )
    831 # push the new requirements onto the stack
    832 new_requirements = dist.requires(req.extras)[::-1]

File ~\anaconda3\envs\ubermag_env\lib\site-packages\pkg_resources\__init__.py:852, in WorkingSet._resolve_dist(self, req, best, replace_conflicting, env, installer, required_by, to_activate)
    849 if dist is None:
    850     # Find the best distribution and add it to the map
    851     dist = self.by_key.get(req.key)
--> 852     if dist is None or (dist not in req and replace_conflicting):
    853         ws = self
    854         if env is None:

File ~\anaconda3\envs\ubermag_env\lib\site-packages\pkg_resources\__init__.py:3204, in Requirement.__contains__(self, item)
   3199     item = item.version
   3201 # Allow prereleases always in order to match the previous behavior of
   3202 # this method. In the future this should be smarter and follow PEP 440
   3203 # more accurately.
-> 3204 return self.specifier.contains(item, prereleases=True)

File ~\anaconda3\envs\ubermag_env\lib\site-packages\pkg_resources\_vendor\packaging\specifiers.py:902, in SpecifierSet.contains(self, item, prereleases, installed)
    900 # Ensure that our item is a Version instance.
    901 if not isinstance(item, Version):
--> 902     item = Version(item)
    904 # Determine if we're forcing a prerelease or not, if we're not forcing
    905 # one for this particular filter call, then we'll use whatever the
    906 # SpecifierSet thinks for whether or not we should support prereleases.
    907 if prereleases is None:

File ~\anaconda3\envs\ubermag_env\lib\site-packages\pkg_resources\_vendor\packaging\version.py:197, in Version.__init__(self, version)
    195 match = self._regex.search(version)
    196 if not match:
--> 197     raise InvalidVersion(f"Invalid version: '{version}'")
    199 # Store the parsed out pieces of the version
    200 self._version = _Version(
    201     epoch=int(match.group("epoch")) if match.group("epoch") else 0,
    202     release=tuple(int(i) for i in match.group("release").split(".")),
   (...)
    208     local=_parse_local_version(match.group("local")),
    209 )

InvalidVersion: Invalid version: '-PKG-VERSION'