i get same thing and i just got a hack attempt detected code Ig and now i cant charge nx so i guess thats it and i just use a new acc that i just log on clean and send nx to my other guy lol
The nx you get from completing The Offers cannot be gifted.
I also get this error, but there are some legits and what not, that also get this error, Try googling it, there is many threads on nexon's forums and what not about them complaining.
Tho is FREE nx, nexon would not really care if there are problems. /