Trouble with transports later in game

Can't Build transports

Posted on Thursday, January 7, 2021

Just when I am ready to invade and conquer other civs I am unable to build transports although I have legions on the planet. THE TRANSPORTS have a "!" symbol next to them but I don't know what it means.  Any new design that has a transport module has he same symbol, "!", and  can't not be built. I am lacking something but i have no idea what. HELP!!