ringui.py:69: GtkWarning: Using Cairo rendering requires the drawable argument to
have a specified colormap. All windows have a colormap,
however, pixmaps only have colormap by default if they
were created with a non-NULL window argument. Otherwise
a colormap must be set on them with gdk_drawable_set_colormap
  self.ctx = self.pixmap.cairo_create()
Traceback (most recent call last):
  File "fringui.py", line 110, in ?
    ui = UI()
  File "fringui.py", line 51, in __init__
    self.create_canvas()
  File "fringui.py", line 69, in create_canvas
    self.ctx = self.pixmap.cairo_create()
cairo.Error: NULL pointer