Burning Crusade problem in the sale of character

[Esmoug]

good morning I write to you because I have a character that I want to put on sale and every time I try I get this message "you are not eligible to sell character in the trading system" and I do not understand why, I have 2 accounts and in both the same thing happens

[skullatbash]

your account need to be premium ( you need to donate just once)