spyder3 starts with message

Traceback (most recent call last):
File "/usr/lib/python3.6/site-packages/spyder/app/mainwindow.py", line 2998, in
main
mainwindow = run_spyder(app, options, args)
File "/usr/lib/python3.6/site-packages/spyder/app/mainwindow.py", line 2902, in
run_spyder
main.setup()
File "/usr/lib/python3.6/site-packages/spyder/app/mainwindow.py", line 864, in
setup
self.projects = Projects(self)
File "/usr/lib/python3.6/site-packages/spyder/plugins/projects.py", line 71, in
init
self.setup_project(self.get_active_project_path())
File "/usr/lib/python3.6/site-packages/spyder/widgets/projects/explorer.py",
line 209, in setup_project
show_all=self.show_all)
File "/usr/lib/python3.6/site-packages/spyder/widgets/explorer.py", line 193,
in setup
self.common_actions = self.setup_common_actions()
File "/usr/lib/python3.6/site-packages/spyder/widgets/projects/explorer.py",
line 53, in setup_common_actions
self.toggle_hscrollbar(self.show_hscrollbar)
File "/usr/lib/python3.6/site-packages/spyder/widgets/projects/explorer.py",
line 68, in toggle_hscrollbar
self.header().setResizeMode(QHeaderView.ResizeToContents)
File "/usr/lib/python3.6/site-packages/qtpy/_patch/qheaderview.py", line 83, in
setResizeMode
raise Exception('setResizeMode is only available in Qt4. Use '
Exception: setResizeMode is only available in Qt4. Use setSectionResizeMode
instead.
Speicherzugriffsfehler (Speicherabzug geschrieben)

    Spyder Version: 3.0.0-1.3
    Python Version: 3.6.1-180.1
    Qt Version: 4.8.7
    PyQt Version: 4.12-6.1, 5.8.2-3.1

Comment:  spyder3 works well with 42.2