cannot create any button.

[liuxiang0]

Environment Info

Pip is not installed

Traceback

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/kivy/core/window/window_sdl2.py", line 727, in mainloop
    self._mainloop()
  File "/usr/lib/python3/dist-packages/kivy/core/window/window_sdl2.py", line 460, in _mainloop
    EventLoop.idle()
  File "/usr/lib/python3/dist-packages/kivy/base.py", line 340, in idle
    self.dispatch_input()
  File "/usr/lib/python3/dist-packages/kivy/base.py", line 325, in dispatch_input
    post_dispatch_input(*pop(0))
  File "/usr/lib/python3/dist-packages/kivy/base.py", line 231, in post_dispatch_input
    listener.dispatch('on_motion', etype, me)
  File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
  File "/usr/lib/python3/dist-packages/kivy/core/window/__init__.py", line 1364, in on_motion
    self.dispatch('on_touch_up', me)
  File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
  File "/usr/lib/python3/dist-packages/kivy/core/window/__init__.py", line 1400, in on_touch_up
    if w.dispatch('on_touch_up', touch):
  File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
  File "/usr/lib/python3/dist-packages/kivy/uix/dropdown.py", line 310, in on_touch_up
    if super(DropDown, self).on_touch_up(touch):
  File "/usr/lib/python3/dist-packages/kivy/uix/scrollview.py", line 848, in on_touch_up
    if self.dispatch('on_scroll_stop', touch):
  File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
  File "/usr/lib/python3/dist-packages/kivy/uix/scrollview.py", line 887, in on_scroll_stop
    self.simulate_touch_down(touch)
  File "/usr/lib/python3/dist-packages/kivy/uix/scrollview.py", line 607, in simulate_touch_down
    ret = super(ScrollView, self).on_touch_down(touch)
  File "/usr/lib/python3/dist-packages/kivy/uix/widget.py", line 460, in on_touch_down
    if child.dispatch('on_touch_down', touch):
  File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
  File "/usr/lib/python3/dist-packages/kivy/uix/widget.py", line 460, in on_touch_down
    if child.dispatch('on_touch_down', touch):
  File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
  File "/usr/lib/python3/dist-packages/kivy/uix/behaviors/button.py", line 151, in on_touch_down
    self.dispatch('on_press')
  File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
  File "/home/liu/working/kivy-designer/designer/uix/action_items.py", line 183, in on_press
    self.cont_menu.dismiss()
AttributeError: 'NoneType' object has no attribute 'dismiss'

End of Traceback

[liuxiang0]

[CRITICAL] [Clock ] Warning, too much iteration done before the next frame. Check your code, or increase the Clock.max_iteration attribute

[liuxiang0]

when I run:

make style

I get the error:

(ve_kvd) liu@T440:~/working/kivy-designer$ make style
python tools/pep8checker/pep8kivy.py .
./ve_kvd/bin/activate_this.py:18:81: E501 line too long (90 > 80 characters)
Makefile:16: recipe for target 'style' failed
make: *** [style] Error 1

Environments:

Ubuntu 18.04, Python 3.6.5, Requirements.txt is below:
(ve_kvd) liu@T440:~/working/kivy-designer$ pip freeze
argh==0.26.2
certifi==2018.8.24
chardet==3.0.4
docutils==0.14
gitdb2==2.0.4
GitPython==2.1.11
idna==2.7
jedi==0.12.1
Kivy==1.10.1
Kivy-Garden==0.1.4
nose==1.3.7
parso==0.3.1
pathtools==0.1.2
pygame==1.9.4
Pygments==2.2.0
PyYAML==3.13
requests==2.19.1
six==1.11.0
smmap2==2.0.4
urllib3==1.23
watchdog==0.8.3

Does anyone know why?