Hello, I went to open my map and this error message appeared.

Error while running event Transport_Drones::on_configuration_changed
Given entity doesn't exist anymore.
stack traceback:
[C]: in function 'set_command'
Transport_Drones/script/transport_drone.lua:665: in function 'go_to_depot'
Transport_Drones/script/transport_drone.lua:164: in function 'pickup_from_supply'
Transport_Drones/script/transport_drone.lua:860: in function 'on_configuration_changed'
core/lualib/event_handler.lua:87: in function <core/lualib/event_handler.lua:84>

I'm having the same problem. I left my game, enabled solar calculator without updating any other mods and came back to this error. I'm using the Nullius mod.