The mod Virtual Train Monitor (0.2.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event virtm::on_init()
Gui element with name window already present in the parent element.
stack traceback:
[C]: in function 'add'
flib/gui.lua:65: in function 'add'
virtm/scripts/gui/main_gui.lua:160: in function 'create_gui'
virtm/control.lua:113: in function 'on_init'
core/lualib/event_handler.lua:69: in function <core/lualib/event_handler.lua:64>
loading save without this previously enabled

I couldn't reproduce the error, but I suspect the very generic window name was choosen by another mod aswell. I changed the name and this should no longer happen.

^_^