Originally Posted by khorn102
I can't because you can't make armies when you have over the pop limit.
That's what I thought too. But it seems that your army and town have different pop limits (I think?) and if you make a big enough army so that the town population limit is under cap again it should work. If you try and complete your transferring whilst either the army or your town are over the limit it will come up as invalid. So it's a kind of balancing act.
I had this issue starting off where all the free units that kept appearing put me well over the limit.