Just updated and this appreared.
The mod Bottleneck caused a non-recoverable error.
Please report this error to the mod author.
Error while running event Bottleneck::on_configuration_changed
real number expected got nil.
stack traceback:
Bottleneck/control.lua:83: in function 'new_signal'
Bottleneck/control.lua:110: in function 'built'
Bottleneck/control.lua:142: in function 'rebuild_overlays'
Bottleneck/control.lua:261: in function <Bottleneck/control.lua:244>
stack traceback:
[C]: in function 'newindex'
__Bottleneck/control.lua:83: in function 'new_signal'
Bottleneck/control.lua:110: in function 'built'
Bottleneck/control.lua:142: in function 'rebuild_overlays'
Bottleneck/control.lua:261: in function <Bottleneck/control.lua:244>