L2jfree core error log L2J

[alonew]

my gameserver has some error log for many days.i don't know how to fix it.

WARNING [28 May 22:11:26,000] com.l2jfree.util.HandlerRegistry.register(): ItemHandler: Replaced type(5944), com.l2jfree.gameserver.handler.itemhandlers.AdvQuestItems@d77e40 -> com.l2jfree.gameserver.handler.itemhandlers.ExtractableItems@1a1ce72.
com.l2jfree.gameserver.jdklogextensions.L2RuntimeLogFormatter$ExtendedLog: This is just an extended feature of logging to show the stacktrace! It's not a real exception to report!
at com.l2jfree.gameserver.jdklogextensions.L2RuntimeLogFormatter.appendThrown(L2RuntimeLogFormatter.java:52)
at com.l2jfree.gameserver.jdklogextensions.L2RuntimeLogFormatter.format0(L2RuntimeLogFormatter.java:44)
at com.l2jfree.gameserver.jdklogextensions.L2LogFormatter.format(L2LogFormatter.java:36)
at java.util.logging.StreamHandler.publish(Unknown Source)
at java.util.logging.FileHandler.publish(Unknown Source)
at java.util.logging.Logger.log(Unknown Source)
at java.util.logging.Logger.doLog(Unknown Source)
at java.util.logging.Logger.logp(Unknown Source)
at org.apache.commons.logging.impl.Jdk14Logger.log(Jdk14Logger.java:98)
at org.apache.commons.logging.impl.Jdk14Logger.warn(Jdk14Logger.java:287)
at com.l2jfree.util.HandlerRegistry.register(HandlerRegistry.java:55)
at com.l2jfree.util.NumberHandlerRegistry.registerAll(NumberHandlerRegistry.java:27)
at com.l2jfree.gameserver.handler.ItemHandler.registerItemHandler(ItemHandler.java:122)
at com.l2jfree.gameserver.handler.ItemHandler.<init>(ItemHandler.java:90)
at com.l2jfree.gameserver.handler.ItemHandler.getInstance(ItemHandler.java:69)
at com.l2jfree.gameserver.GameServer.main(GameServer.java:399)

it seems that some item's type has wrong .these item id is 5944,5955,6007,6008,6009,6010,5966,5967,5968,5969

l2jfree-core rev.5950