Why does Yum command fails with error "ImportError: /usr/lib64/python3.6/site-packages/libdnf/_conf.so" ?

Issue

• Yum command fails with below python traceback error:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/libdnf/conf.py", line 14, in swig_import_helper
    return importlib.import_module(mname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 658, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 571, in module_from_spec
  File "<frozen importlib._bootstrap_external>", line 922, in create_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
ImportError: /usr/lib64/python3.6/site-packages/libdnf/_conf.so: undefined symbol: _ZN6libdnf10ConfigRepo15getMasterConfigEv

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/bin/yum", line 57, in <module>
    from dnf.cli import main
  File "/usr/lib/python3.6/site-packages/dnf/__init__.py", line 30, in <module>
    import dnf.base
  File "/usr/lib/python3.6/site-packages/dnf/base.py", line 29, in <module>
    import libdnf.transaction
  File "/usr/lib64/python3.6/site-packages/libdnf/__init__.py", line 12, in <module>
    from . import conf
  File "/usr/lib64/python3.6/site-packages/libdnf/conf.py", line 17, in <module>
    _conf = swig_import_helper()
  File "/usr/lib64/python3.6/site-packages/libdnf/conf.py", line 16, in swig_import_helper
    return importlib.import_module('_conf')
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
ModuleNotFoundError: No module named '_conf'