Running on Ubuntu 18.04

[pbravakos]

When i try to open a file in Ubuntu 18.04, the program immediately terminates and i get the following error:

INFO   ] [Logger      ] Record log in /home/panos/.kivy/logs/kivy_19-02-28_10.txt
[INFO   ] [Kivy        ] v1.9.1
[INFO   ] [Python      ] v2.7.15rc1 (default, Nov 12 2018, 14:31:15) 
[GCC 7.3.0]
[INFO   ] [Factory     ] 179 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_gif, img_sdl2, img_pil (img_ffpyplayer ignored)
[INFO   ] [OSC         ] using <multiprocessing> for socket
[INFO   ] [Window      ] Provider: sdl2(['window_egl_rpi'] ignored)
[INFO   ] [GL          ] OpenGL version <3.0 Mesa 18.2.2>
[INFO   ] [GL          ] OpenGL vendor <Intel Open Source Technology Center>
[INFO   ] [GL          ] OpenGL renderer <Mesa DRI Intel(R) HD Graphics 520 (Skylake GT2) >
[INFO   ] [GL          ] OpenGL parsed version: 3, 0
[INFO   ] [GL          ] Shading version <1.30>
[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
[INFO   ] [Text        ] Provider: sdl2
 /usr/lib/python2.7/dist-packages/kivy/core/clipboard/clipboard_gtk3.py:14: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
   from gi.repository import Gtk, Gdk
[INFO   ] [Clipboard   ] Provider: gtk3(['clipboard_dbusklipper'] ignored)
xclip version 0.12
Copyright (C) 2001-2008 Kim Saunders et al.
Distributed under the terms of the GNU GPL
[INFO   ] [Cutbuffer   ] Provider: xclip
[INFO   ] [CutBuffer   ] cut buffer support enabled
[INFO   ] [GL          ] NPOT texture support is available
[mcl] usage: mcl <-|file name> [options], do 'mcl -h' or 'man mcl' for help
[INFO   ] [Base        ] Start application main loop
[INFO   ] [Base        ] Leaving application in progress...
 Traceback (most recent call last):
   File "/usr/bin/TriFusion", line 11, in <module>
     load_entry_point('trifusion==1.0.1', 'gui_scripts', 'TriFusion')()
   File "/usr/lib/python2.7/dist-packages/trifusion/TriFusion.py", line 16, in gui_exec
     main()
   File "/usr/lib/python2.7/dist-packages/trifusion/app.py", line 12201, in main
     TriFusionApp(kv_file="trifusion.kv").run()
   File "/usr/lib/python2.7/dist-packages/kivy/app.py", line 828, in run
     runTouchApp()
   File "/usr/lib/python2.7/dist-packages/kivy/base.py", line 487, in runTouchApp
     EventLoop.window.mainloop()
   File "/usr/lib/python2.7/dist-packages/kivy/core/window/window_sdl2.py", line 619, in mainloop
     self._mainloop()
   File "/usr/lib/python2.7/dist-packages/kivy/core/window/window_sdl2.py", line 362, in _mainloop
     EventLoop.idle()
   File "/usr/lib/python2.7/dist-packages/kivy/base.py", line 327, in idle
     Clock.tick()
   File "/usr/lib/python2.7/dist-packages/kivy/clock.py", line 515, in tick
     self._process_events()
   File "/usr/lib/python2.7/dist-packages/kivy/clock.py", line 647, in _process_events
     event.tick(self._last_tick, remove)
   File "/usr/lib/python2.7/dist-packages/kivy/clock.py", line 406, in tick
     ret = callback(self._dt)
   File "/usr/lib/python2.7/dist-packages/kivy/uix/filechooser.py", line 687, in _update_files
     if self._create_files_entries():
   File "/usr/lib/python2.7/dist-packages/trifusion/data/resources/custom_widgets.py", line 703, in _create_files_entries
     ev = self._create_files_entries_ev
 AttributeError: 'FileChooserM' object has no attribute '_create_files_entries_ev'

If you have any idea why this is happening please tell me.
Thanks
Panos