I was in the editor mode, with "Ignore surface conditions" enabled. Tried to place a lightning rod and got the pictured error.
I'd hoped to be able to place and potentially preview the coverage area inside a planning save.
(Yes, I'm aware that, as a workaround, I can invoke the editor on the Fulgoran surface...)
[2.0.54] Lightning Rods don't honor editor "Ignore Surface Conditions"
Re: [2.0.54] Lightning Rods don't honor editor "Ignore Surface Conditions"
This can apparently be closed as a duplicate. I'd searched the Bug Reports forum, but apparently it popped up over in modding interface already.
viewtopic.php?p=666303
viewtopic.php?p=666303