I tried to use cheat "LOADMONSTER" on the GM Command to call some uniques like Medusa, Roc, IsIs, Eris,... After I entered it, I received the message "Cheat key success !!", however, I didn't receive any notification on the screen that "[Uniques name] has appeared in [Address]", and the uniques that I called by GM Command only glimpse and disappeared soon after!

Please help me fix this error!