It shouldnt ,make any difference to most people but I figured I'd post it.

The mod Treefarm-Lite v0.17 caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Treefarm-Lite-fix::on_put_item (ID 9)
Key "column_count" not found in property tree at ROOT
stack traceback:
Treefarm-Lite-fix/control.lua:815: in function 'construct_farm_configuration_gui'
Treefarm-Lite-fix/control.lua:1154: in function <Treefarm-Lite-fix/control.lua:1144>
stack traceback:
[C]: in function 'add'
Treefarm-Lite-fix/control.lua:815: in function 'construct_farm_configuration_gui'
Treefarm-Lite-fix/control.lua:1154: in function <Treefarm-Lite-fix/control.lua:1144>

Thanks for posting this bug, but I was not able to reproduce it.
Can you describe in more detail what you have done?

I was using ghosts of yellow belts to measure distances between advanced treefarms(as there is no border so easily space them like the basic ones. had conveyor belts in hand, shift down clicked on advanced treefarm instead of next to it.

got the same error didn`t knew why but i was also building with blueprints, that contained belts so it might be possible but there were also a lot of other mods in that world...
An error message ocurred that said:

Error while running event Treefarm-Lite-fix::on_put_item (ID 9)
Key "column_count" not found in porperty tree at ROOT
stack traceback:
Treefarm-Life-fix/control.lua:815: in function
'construct_farm_configuration_gui'
Treefarm-Lite-fix/control.lua:1154: in function
<Treefarm-Lite-fix/control.lua:1144>
stack traceback
[C]: in function 'add'
Treefarm-Lite-fix/control.lua:815: in function
'construct_farm_configuration_gui'
Treefarm-Lite-fix/control.lua:1154: in function
<Treefarm-Lite-fix/control.lua:1144>

Game version: 0.17.79
Mod version: 17.0.8
*sorry for the bad english, i`m from germany so english is not my first language