Hello,
Yes I am using L2J, I fixed the problem by updating to the latest version of L2J nighties, now it works fine. (The previous version of L2J I was using was compiled in 2011)
I also got some feedback for you - your info.txt says
"Installation:
2 - Copy the folder enchantmanager to game/data/scripts/custom."
but the game looks for your script in
"\server\game\data\scripts\custom\mondial\enchantmanager"
so i had to manually make the folder "mondial" in the custom folder for it to work.
I'm not sure if thats intentional or not, just thought i'd let you know.
Other than that the npc is awesome. :D