Level.rcc is damaged or incorrect version, Please download full client(BabyRanEn3)

I am new to this game and I just found this game at the internet cafe and it seems to have caught my interest and I decided to copy the game but when I started it as what the title says it tells me that "level.rcc is damaged ....." anyone knows whats the solution to this problem?

You're in a wrong section sir.. please go to the help section