FTB error

C:\Users\Chazz\Desktop\server>java -Xms512M -Xmx1G -jar ftbserver.jar
Exception in thread "main" java.lang.NullPointerException
        at cpw.mods.fml.relauncher.FMLRelaunchLog.resetLoggingHandlers(FMLRelaun
chLog.java:186)
        at cpw.mods.fml.relauncher.FMLRelaunchLog.configureLogging(FMLRelaunchLo
g.java:170)
        at cpw.mods.fml.relauncher.FMLRelaunchLog.log(FMLRelaunchLog.java:216)
        at cpw.mods.fml.relauncher.FMLRelaunchLog.info(FMLRelaunchLog.java:248)
        at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:15
0)
        at cpw.mods.fml.relauncher.FMLRelauncher.relaunchServer(FMLRelauncher.ja
va:133)
        at cpw.mods.fml.relauncher.FMLRelauncher.handleServerRelaunch(FMLRelaunc
her.java:33)
        at net.minecraft.server.MinecraftServer.main(MinecraftServer.java:1376)