trading issues

hey guys i just want to know how does the trading thing work cause i want to trade my rogue for a hunter and each time i want to do it a pop op message comes up saying there is an error in the description box but i can't find any errors, so if someone can please just help me trade my rogue for hunter it would be awesome.
thanks guys

you can't actually trade 1 char for another (altho I did make a thread on forum... 0 replies), you can only sell your rogue and then buy a hunter with the coins you get