pip install ERROR : Error while checking for conflicts

[almondh]

• pip version:20.2
• Python version:Python 3.7.4
• Operating system: macOS Catalina 10.15.6

How can i fix this error???
i want to do pip install...

ERROR: Error while checking for conflicts. Please file an issue on pip's issue tracker: https://github.com/pypa/pip/issues/new
Traceback (most recent call last):
  File "/usr/local/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3021, in _dep_map
    return self.__dep_map
  File "/usr/local/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2815, in __getattr__
    raise AttributeError(attr)
AttributeError: _DistInfoDistribution__dep_map

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3012, in _parsed_pkg_info
    return self._pkg_info
  File "/usr/local/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2815, in __getattr__
    raise AttributeError(attr)
AttributeError: _pkg_info

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/anaconda3/lib/python3.7/site-packages/pip/_internal/commands/install.py", line 535, in _determine_conflicts
    return check_install_conflicts(to_install)
  File "/usr/local/anaconda3/lib/python3.7/site-packages/pip/_internal/operations/check.py", line 108, in check_install_conflicts
    package_set, _ = create_package_set_from_installed()
  File "/usr/local/anaconda3/lib/python3.7/site-packages/pip/_internal/operations/check.py", line 50, in create_package_set_from_installed
    package_set[name] = PackageDetails(dist.version, dist.requires())
  File "/usr/local/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2736, in requires
    dm = self._dep_map
  File "/usr/local/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3023, in _dep_map
    self.__dep_map = self._compute_dependencies()
  File "/usr/local/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3032, in _compute_dependencies
    for req in self._parsed_pkg_info.get_all('Requires-Dist') or []:
  File "/usr/local/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3014, in _parsed_pkg_info
    metadata = self.get_metadata(self.PKG_INFO)
  File "/usr/local/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 1420, in get_metadata
    value = self._get(path)
  File "/usr/local/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 1616, in _get
    with open(path, 'rb') as stream:
FileNotFoundError: [Errno 2] No such file or directory: '/usr/local/anaconda3/lib/python3.7/site-packages/jupyter-1.0.0.dist-info/METADATA'

[uranusjr]

Duplicate to #8676.