Trying to unequip your ships says you need to land on a planet or station, even if you are already on one. It makes sence that you can't unequip your ship and are meant to replace it if anything, but there should be a special message for this.

Hello HyperSoop, Translation is now fixed for the error message when trying to unequip your current ship. Fix will go live along with the v0.2.7 game update. Thank you. Regards, Lukas Tokar