Don't let me make Antidote[2]

[Vipera]

Can anyone tell me, whats happening here?
I purchased this skill antidote t2 skill, learned it, but i can't make it coz it saying i hvn't learned it yet. Is it a bug, plz fix it.


http://i290.photobucket.com/albums/ll243/Viper_here/Antidoteskillt2prob.jpg

Thanks in Advance