Why does leapp preupgrade check fails with error "Command ['rm', '-rf', '/var/lib/leapp/el8userspace'] failed with exit code 1"

Issue

• Leapp preupgrade check fails with below error :

Risk Factor: high (error)
Title: Actor target_userspace_creator unexpectedly terminated with exit code: 1
Summary: Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/leapp/repository/actor_definition.py", line 74, in _do_run
    actor_instance.run(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/leapp/actors/__init__.py", line 289, in run
    self.process(*args)
  File "/usr/share/leapp-repository/repositories/system_upgrade/common/actors/targetuserspacecreator/actor.py", line 58, in process
    userspacegen.perform()
  File "/usr/lib/python2.7/site-packages/leapp/utils/deprecation.py", line 42, in process_wrapper
    return target_item(*args, **kwargs)
  File "/usr/share/leapp-repository/repositories/system_upgrade/common/actors/targetuserspacecreator/libraries/userspacegen.py", line 857, in perform
    _create_target_userspace(context, indata.packages, indata.files, target_repoids)
  File "/usr/share/leapp-repository/repositories/system_upgrade/common/actors/targetuserspacecreator/libraries/userspacegen.py", line 825, in _create_target_userspace
    prepare_target_userspace(context, target_path, target_repoids, list(packages))
  File "/usr/share/leapp-repository/repositories/system_upgrade/common/actors/targetuserspacecreator/libraries/userspacegen.py", line 230, in prepare_target_userspace
    run(['rm', '-rf', userspace_dir])
  File "/usr/lib/python2.7/site-packages/leapp/libraries/stdlib/__init__.py", line 192, in run
    result=result
CalledProcessError: Command ['rm', '-rf', '/var/lib/leapp/el8userspace'] failed with exit code 1.