i am getting this error when running the gui in Ubuntu 18.04.2 LTS (using the wxg-tk packages from the official Ubuntu repos):
raceback (most recent call last):
File "/home/andy/.local/bin/mymcplus", line 11, in <module>
sys.exit(main())
File "/home/andy/.local/lib/python3.6/site-packages/mymcplus/mymc.py", line 737, in main
gui.run()
File "/home/andy/.local/lib/python3.6/site-packages/mymcplus/gui/gui.py", line 517, in run
frame = GuiFrame(None, "mymc+", filename)
File "/home/andy/.local/lib/python3.6/site-packages/mymcplus/gui/gui.py", line 186, in __init__
icon_win = IconWindow(info_win, self)
File "/home/andy/.local/lib/python3.6/site-packages/mymcplus/gui/icon_window.py", line 130, in __init__
self.context = glcanvas.GLContext(self.canvas)
wx._core.wxAssertionError: C++ assertion "vi" failed at ../src/unix/glx11.cpp(128) in wxGLContext(): invalid visual for OpenGL