When loading a network save in factorio 16.49 with mod 1.0.3, I get:
Error while running on_init: Gui element railway-painter_open_gui_button already present in the parent element.
stack traceback:
railway-painter/src/player/gui/GuiBuilder.lua:18 in function 'createGuiButton'
Also, when I color a train manually with some color, and then paste the color's RGB values to the Railway Painter, the resulting color is definitely darker.