Bug Rail won't dock on old BP

[Captain Tankman]

Hey Folks.

With the new rail updated I wanted to hop back into the game a bit.

I toyed a bit with the rails and everything worked fine, but then I loaded one of my older ships in to refit it with rails but it won't work. It says "can't mix rails with old docking system" but I'm using the new blocks.
Won't work with the turret-rail blocks nor with normal rail blocks:

 

[Crusade]

Remove all old docks/turret dock from your ship before trying to add new rail-docked things.

 

[Captain Tankman]

Thanks for the quick answer! It's working now!

 

[Sven_The_Slayer]

Your question has already been answered but I would like to welcome you back!