How do i fix a bugged flyff private server file?

OK well there is this private server i play on and we got new files but there bugged so we cant open are inventory and there are no NPC's what do i do?|||What's the point of playing on a flyff private server if it's already free?.....And no one here can help you because you didn't say which private server and what new files you are talking about. Plus, you could always ask other people in the game....