Platform (Browser -Chrome, Firefox etc / Mini client) : Mini Client and Chrome
Server number : S876
Character name : Yua
UID (Facebook account - you can find your UID on the bottom of the Facebook page, Oasis account - go to your profile page and click on your avatar) : 200000089766764

Description of the problem you are experiencing : Can't use world chat and when creating a group, the name is always invalid

Screenshot of the error page :

Operating system : Windows 8
Screen resolution : 1600 x 900
Your computer time zone and your country : western Indonesia time Indonesia
Are you using VPN ? : No