I got this while placing solar panels inside a dome in Maraxis:

Error while running event power-propagation::on_robot_built_entity (ID 17)
Unknown entity name: power-propagation-invisible-pole-32
stack traceback:
[C]: in function 'create_entity'
power-propagation/control.lua:128: in function <power-propagation/control.lua:111>
(...tail calls...)
power-propagation/control.lua:41: in function 'connect_nearby_entities_to_pole'
power-propagation/control.lua:274: in function <power-propagation/control.lua:266>