Crash on startup

[qt1]

After installation it seems like a window is opened but closes immediately.

OS: ubuntu 16.04

Info: [INFO ] [Logger ] Record log in /home/baruch/.kivy/logs/kivy_18-08-01_11.txt [INFO ] [Kivy ] v1.10.1 [INFO ] [Python ] v3.5.2 (default, Nov 23 2017, 16:37:01) [GCC 5.4.0 20160609] [INFO ] [Factory ] 194 symbols loaded [INFO ] [Image ] Providers: img_tex, img_dds, img_sdl2, img_pil, img_gif (img_ffpyplayer ignored) [INFO ] [Text ] Provider: pil(['text_sdl2'] ignored) [INFO ] [Window ] Provider: sdl2(['window_egl_rpi'] ignored) [INFO ] [GL ] Using the "OpenGL" graphics system [INFO ] [GL ] Backend used [INFO ] [GL ] OpenGL version <b'4.5.0 NVIDIA 384.130'> [INFO ] [GL ] OpenGL vendor <b'NVIDIA Corporation'> [INFO ] [GL ] OpenGL renderer <b'GeForce GTX 660 Ti/PCIe/SSE2'> [INFO ] [GL ] OpenGL parsed version: 4, 5 [INFO ] [GL ] Shading version <b'4.50 NVIDIA'> [INFO ] [GL ] Texture max size <16384> [INFO ] [GL ] Texture max units <32> [INFO ] [Window ] auto add sdl2 input provider [INFO ] [Window ] virtual keyboard not allowed, single mode, not docked Traceback (most recent call last): File "/usr/lib/python3.5/runpy.py", line 184, in _run_module_as_main "main", mod_spec) File "/usr/lib/python3.5/runpy.py", line 85, in _run_code exec(code, run_globals) File "/home/baruch/w/tools/kivy-designer/designer/main.py", line 3, in from designer.app import DesignerApp File "/home/baruch/w/tools/kivy-designer/designer/app.py", line 14, in from designer.components.dialogs.add_file import AddFileDialog File "/home/baruch/w/tools/kivy-designer/designer/components/dialogs/add_file.py", line 5, in from kivy.garden.xpopup.file import XFileOpen, XFolder File "", line 969, in _find_and_load File "", line 958, in _find_and_load_unlocked File "", line 664, in _load_unlocked File "", line 636, in _load_backward_compatible KeyError: 'kivy.garden.xpopup'