I've also had this problem, what seems to be happening is the RTG is trying to generate depleted fuel but there aren't any possible containers for it in RO so instead the part just complains it cant create it's outputs and won't start. I've fixed it by editing the RO_Squad_Electrical.cfg so that the part no longer generates depleted fuel, but a better long term fix would be to add the ability to hold depleted fuel in modular tanks.
[1.1.2] Realism Overhaul v11.0.0 May 8
in KSP1 Mod Releases
Posted
I've also had this problem, what seems to be happening is the RTG is trying to generate depleted fuel but there aren't any possible containers for it in RO so instead the part just complains it cant create it's outputs and won't start. I've fixed it by editing the RO_Squad_Electrical.cfg so that the part no longer generates depleted fuel, but a better long term fix would be to add the ability to hold depleted fuel in modular tanks.