To title this "Game Breaking Error Found," and then to have the first words you say are, "I know it is not gamebreaking," is pretty damned stupid!

1. You need the crystal tech or some such in the "magic" tech tree.
2. It needs to be in your zone of influence.
3. You need enough gilder, citizens, and materials to build it.

As far as the title goes, it's kinda like yelling fire in a crowded theater, without any fire.  Please try not to be so provacative and misleading next time, kay.  Have a .