I get this error when put balancer or swapper:

Error while running event beltutils::on_built_entity (ID 6)
beltutils/prototypes/control-helpers.lua:67: attempt to index local 'top' (a nil value)
stack traceback:
beltutils/prototypes/control-helpers.lua:67: in function 'build_visible_1_by_2'
beltutils/prototypes/lane_swapper/control.lua:95: in function 'build_swapper'
beltutils/prototypes/lane_swapper/control.lua:163: in function 'entry'
beltutils/control.lua:63: in function 'call_all_events'
beltutils/control.lua:92: in function <beltutils/control.lua:91>

Do you have a few more details? The code where that is having an error is creating an entity, but it would only be nil if the game failed to make the entity. Do you have some other mods installed?

I am going to need more info to reproduce this.

I wanted record video about error, but got new error.

https://youtu.be/8kr6Ei6lWwQ

Error while running event beltutils::on_player_mined_entity (ID 67)
beltutils/prototypes/lane_balancer/control.lua:195: bad argument #1 of 2 to 'pairs' (table expected, got nil)
stack traceback:
[C]: in function 'pairs'
beltutils/prototypes/lane_balancer/control.lua:195: in function 'handle_mined'
beltutils/prototypes/lane_balancer/control.lua:258: in function 'entry'
beltutils/control.lua:63: in function 'call_all_events'
beltutils/control.lua:110: in function <beltutils/control.lua:108>

Please make sure your running the latest version of the mod. That error and video both are from version 0.0.5. Although, I still checked the area of code that this happened in, and just pushed an update for it.

I found problem mod. It is "aai-programmable-vehicles"
(https://mods.factorio.com/mod/aai-programmable-vehicles)

Pls watch my video: https://youtu.be/aPOR78PpZcI

Thanks, I will look into it to see if I can make my mod work with that mod properly.

Hey this should be fixed now =)

I like your mod, very like!

Thanks