我一直在努力使biopython工作，似乎我在此过程中破坏了conda。此时，将显示conda的帮助菜单，并conda --version返回，conda 4.7.5但其他任何conda info错误（包括抛出错误）AttributeError: dlsym(0x1004381c0, archive_read_open_filename_w): symbol not found

这是在Mac OS 10.14.4上。康达只是在工作，我上次用它来安装biopython时没有错误conda install -c conda-forge biopython。运行import Bio仍然导致ImportError: No module named Bio。因此，在故障排除中，我运行了pip uninstall biopython（它说它成功卸载了biopython-1.73），pip install biopython并返回了：

Requirement already satisfied: biopython in /Users/dmattox/anaconda/lib/python2.7/site-packages (1.73)
Requirement already satisfied: numpy in /Users/dmattox/anaconda/lib/python2.7/site-packages (from biopython) (1.13.1)

然后，我再次尝试使用conda进行安装，conda install -c conda-forge biopython该错误返回了我从上面显示的错误conda info。我现在尝试使用conda进行任何操作时，都会出现此AttributeError。我在下面包括了追溯。有什么建议？

Traceback (most recent call last):
  File "/Users/dmattox/anaconda/bin/conda", line 13, in <module>
    sys.exit(main())
  File "/Users/dmattox/anaconda/lib/python2.7/site-packages/conda/cli/main.py", line 150, in main
    return conda_exception_handler(_main, *args, **kwargs)
  File "/Users/dmattox/anaconda/lib/python2.7/site-packages/conda/exceptions.py", line 1335, in conda_exception_handler
    return_value = exception_handler(func, *args, **kwargs)
  File "/Users/dmattox/anaconda/lib/python2.7/site-packages/conda/exceptions.py", line 1046, in __call__
    return self.handle_exception(exc_val, exc_tb)
  File "/Users/dmattox/anaconda/lib/python2.7/site-packages/conda/exceptions.py", line 1090, in handle_exception
    return self.handle_unexpected_exception(exc_val, exc_tb)
  File "/Users/dmattox/anaconda/lib/python2.7/site-packages/conda/exceptions.py", line 1101, in handle_unexpected_exception
    self.print_unexpected_error_report(error_report)
  File "/Users/dmattox/anaconda/lib/python2.7/site-packages/conda/exceptions.py", line 1171, in print_unexpected_error_report
    from .cli.main_info import get_env_vars_str, get_main_info_str
  File "/Users/dmattox/anaconda/lib/python2.7/site-packages/conda/cli/main_info.py", line 19, in <module>
    from ..core.index import _supplement_index_with_system
  File "/Users/dmattox/anaconda/lib/python2.7/site-packages/conda/core/index.py", line 9, in <module>
    from .package_cache_data import PackageCacheData
  File "/Users/dmattox/anaconda/lib/python2.7/site-packages/conda/core/package_cache_data.py", line 15, in <module>
    from conda_package_handling.api import InvalidArchiveError
  File "/Users/dmattox/anaconda/lib/python2.7/site-packages/conda_package_handling/api.py", line 3, in <module>
    from libarchive.exception import ArchiveError as _LibarchiveArchiveError
  File "/Users/dmattox/anaconda/lib/python2.7/site-packages/libarchive/__init__.py", line 1, in <module>
    from .entry import ArchiveEntry
  File "/Users/dmattox/anaconda/lib/python2.7/site-packages/libarchive/entry.py", line 6, in <module>
    from . import ffi
  File "/Users/dmattox/anaconda/lib/python2.7/site-packages/libarchive/ffi.py", line 184, in <module>
    c_int, check_int)
  File "/Users/dmattox/anaconda/lib/python2.7/site-packages/libarchive/ffi.py", line 95, in ffi
    f = getattr(libarchive, 'archive_'+name)
  File "/Users/dmattox/anaconda/lib/python2.7/ctypes/__init__.py", line 375, in __getattr__
    func = self.__getitem__(name)
  File "/Users/dmattox/anaconda/lib/python2.7/ctypes/__init__.py", line 380, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: dlsym(0x100548400, archive_read_open_filename_w): symbol not found