Human has a bunch of bugs that don't explain much, with the error message "this structure cannot be built near a Stronghold" being one of the most cryptic.
How to Fix Network Errors in Once Human
It appears when you build structures in your area, and won’t appear for everyone. It only appears if you build your base around specific structures or parts of the world, but when you encounter it, it can put a dent in your plans to create a sprawling base of operations. So, how do you overcome it?
The error message "This structure cannot be built near a stronghold" appears when building your territory on or next to a road in Once Human.
If you try to build anything on a road, any structure, you will not be able to place it. The error only seems to appear if you try to place a wall, roof, or other overlapping structures, while if you place a floor, the game tells you that you can't build it anyway.
