Description of problem:
Every time I start radicale (i.e. on every boot because it is set to auto-start on boot), radicale crashes.

Please do not use exact versions in the code. If you insist on doing so, please also use exact versions in RPM dependencies.

Version-Release number of selected component:
radicale-2.1.9-5.fc29

Additional info:
reporter:       libreport-2.9.5
cmdline:        /usr/bin/python3 /usr/bin/radicale --daemon --pid=/var/run/radicale/radicale.pid
crash_function: resolve
exception_type: pkg_resources.ContextualVersionConflict
executable:     /usr/bin/radicale
interpreter:    python3-3.7.0-9.fc29.x86_64
kernel:         4.18.11-301.fc29.x86_64
runlevel:       unknown
type:           Python3

Truncated backtrace:
__init__.py:781:resolve:pkg_resources.DistributionNotFound: The 'python-dateutil==2.6.1' distribution was not found and is required by Radicale

Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 578, in _build_master
    ws.require(__requires__)
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 895, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 786, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (python-dateutil 2.7.0 (/usr/lib/python3.7/site-packages), Requirement.parse('python-dateutil==2.6.1'), {'Radicale'})

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/radicale", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3112, in <module>
    @_call_aside
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3096, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3125, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 580, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 593, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 781, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'python-dateutil==2.6.1' distribution was not found and is required by Radicale

Local variables in innermost frame:
self: <pkg_resources.WorkingSet object at 0x7fa88a9956d8>
requirements: [Requirement.parse('vobject==0.9.5')]
env: <pkg_resources.Environment object at 0x7fa88a977ef0>
installer: None
replace_conflicting: False
extras: None
processed: {Requirement.parse('Radicale==2.1.9'): True}
best: {'radicale': Radicale 2.1.9 (/usr/lib/python3.7/site-packages), 'python-dateutil': None}
to_activate: [Radicale 2.1.9 (/usr/lib/python3.7/site-packages)]
req_extras: {Requirement.parse('python-dateutil==2.6.1'): (), Requirement.parse('vobject==0.9.5'): ()}
required_by: defaultdict(<class 'set'>, {Requirement.parse('python-dateutil==2.6.1'): {'Radicale'}, Requirement.parse('vobject==0.9.5'): {'Radicale'}})
req: Requirement.parse('python-dateutil==2.6.1')
dist: None
ws: <pkg_resources.WorkingSet object at 0x7fa88a9956d8>
requirers: {'Radicale'}
new_requirements: [Requirement.parse('python-dateutil==2.6.1'), Requirement.parse('vobject==0.9.5')]
new_requirement: Requirement.parse('vobject==0.9.5')