I have a desert planet I am shading, and it says: The effort is stalled because there is not enough water-ice. Build a Drone Control Nexus on an orbital station in this system. I do not see the option to build it at all.
You need one of two:
1. Colonize water rich type of planet in that system (water-covered, frozen, cryovolcanic) if any exist. Build Ismara slingshot. Wait.
2. Have a
Player Station Construction mod.
Warning! Can be installed without starting new game, but not removed. Construct any station and build a drone control nexus there. Wait.
You should be aware, there are special conditions to build stations, and it is probably better to read initial post and customize setting file of station construction mod
before launching. You may not need all the content from there, or you may activate some additional features, like cramped environment.