Description of problem:
trying to exec command 

dnf groupinfo cinnamon

Version-Release number of selected component:
dnf-2.7.5-12.fc28

Additional info:
reporter:       libreport-2.9.5
cmdline:        /usr/bin/python3 /usr/bin/dnf groupinfo cinnamon
crash_function: _add_from_xml_filename
exception_type: _libpycomps.ParserError
executable:     /usr/bin/dnf
interpreter:    python3-3.6.5-1.fc28.x86_64
kernel:         4.16.13-300.fc28.x86_64
runlevel:       N 5
type:           Python3
uid:            1000

Truncated backtrace:
comps.py:328:_add_from_xml_filename:_libpycomps.ParserError: Fatal parser error

Traceback (most recent call last):
  File "/usr/bin/dnf", line 58, in <module>
    main.user_main(sys.argv[1:], exit_code=True)
  File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 179, in user_main
    errcode = main(args)
  File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 64, in main
    return _main(base, args, cli_class, option_parser_class)
  File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 99, in _main
    return cli_run(cli, base)
  File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 115, in cli_run
    cli.run()
  File "/usr/lib/python3.6/site-packages/dnf/cli/cli.py", line 1016, in run
    return self.command.run()
  File "/usr/lib/python3.6/site-packages/dnf/cli/commands/group.py", line 375, in run
    self._grp_setup()
  File "/usr/lib/python3.6/site-packages/dnf/cli/commands/group.py", line 108, in _grp_setup
    self.base.read_comps(arch_filter=True)
  File "/usr/lib/python3.6/site-packages/dnf/base.py", line 673, in read_comps
    self._comps._add_from_xml_filename(decompressed)
  File "/usr/lib/python3.6/site-packages/dnf/comps.py", line 328, in _add_from_xml_filename
    ret = comps.fromxml_f(fn)
_libpycomps.ParserError: Fatal parser error

Local variables in innermost frame:
comps: <_libpycomps.Comps object at 0x7f2eaba4ba98>
fn: '/var/tmp/dnf-alireza-sfabxalf/updates-8bd9ef368505a5fd/repodata/gen/groups.xml'
self: <dnf.comps.Comps object at 0x7f2eaba41668>

Potential duplicate: bug 1537957