I have this same system message when trying to built an Academy.
I have ironmines & agriculture fields & sawmines upgraded to level 4 & 5, I built other installations like Inn, barracks, workshop, etc, but I can't build an Academy. The label beneath the icon of the Academy, is inactive, menawhile other buildings labels are ready to use. Can smone tell me why plzz? Is this due to I haven't upgraded my townhall to level two yet?