Cant buy offensive weapons... on a space station?

Ok heres the deal, I am trying to buy some weapons to boost my military index, but I keep running into the problem of the game telling me this :

"You can buy Conventional Missile Batteries on a Space Station.
Please close contracts, buy it directly or buy it on a Space Station."

Thing is I dont have a space station, nor am I playing in space at all... how do I fix this?

You either find someone to sell you these missiles on your own world or, for now,
don't buy them.

These batteries are not essential and are intended for premium players.

This means you can not buy Conventional Missiles over the open market. You have to find someone to sell them to you directly or you will have to do without.

Or buy a shuttle, rent a dock on the space station that sells conv missiles and pay GC for them.