If you are receiving error messages when you attempt to purchase NCoin, there are a few other payment options you can try. You may want to refer to this link for more details:
http://www.lineage2.com/en/marketplace/buy-ncoin/
- Use a Credit Card
- Use Paypal
- Purchase NCoin Cards from your local GameStop
- Purchase NCoin Cards from Amazon.com
- If none of these options work, please click here to contact Support.