The mod Transport Drones (GamerBoyz Fix) (2.0.21) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Transport_Drones_GB::on_lua_shortcut (ID 42)
Unknown sprite "utility/close_white"
stack traceback:
[C]: in function 'add'
Transport_Drones_GB/script/gui.lua:775: in function 'open_gui'
Transport_Drones_GB/script/gui.lua:927: in function 'toggle_gui'
Transport_Drones_GB/script/gui.lua:933: in function 'handler'
core/lualib/event_handler.lua:72: in function <core/lualib/event_handler.lua:70>