[10:16:40 ERROR]: Couldn't process command
java.lang.NullPointerException
	at abn.s(SourceFile:375) ~[minecraft_server.13w43a.jar:?]
	at abn.E(SourceFile:614) ~[minecraft_server.13w43a.jar:?]
	at at.b(SourceFile:71) ~[minecraft_server.13w43a.jar:?]
	at z.a(SourceFile:58) [minecraft_server.13w43a.jar:?]
	at mw.d(SourceFile:486) [minecraft_server.13w43a.jar:?]
	at mw.a(SourceFile:473) [minecraft_server.13w43a.jar:?]
	at ie.a(SourceFile:37) [minecraft_server.13w43a.jar:?]
	at ie.a(SourceFile:9) [minecraft_server.13w43a.jar:?]
	at em.a(SourceFile:145) [minecraft_server.13w43a.jar:?]
	at ms.c(SourceFile:134) [minecraft_server.13w43a.jar:?]
	at net.minecraft.server.MinecraftServer.u(SourceFile:529) [minecraft_server.13w43a.jar:?]
	at lj.u(SourceFile:259) [minecraft_server.13w43a.jar:?]
	at net.minecraft.server.MinecraftServer.t(SourceFile:441) [minecraft_server.13w43a.jar:?]
	at net.minecraft.server.MinecraftServer.run(SourceFile:358) [minecraft_server.13w43a.jar:?]
	at ky.run(SourceFile:617) [minecraft_server.13w43a.jar:?]

[10:21:02] [Server Shutdown Thread/INFO]: Stopping server
[10:21:02] [Server Shutdown Thread/INFO]: Saving players
2013-10-22 10:21:02,685 ERROR Attempted to append to non-started appender ServerGuiConsole
Exception in thread "Server Shutdown Thread" org.apache.logging.log4j.core.appender.AppenderLoggingException: Attempted to append to non-started appender Server
GuiConsole
        at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:89)
        at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:425)
        at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:406)
        at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:367)
        at org.apache.logging.log4j.core.Logger.log(Logger.java:110)
        at org.apache.logging.log4j.spi.AbstractLogger.info(AbstractLogger.java:1011)
        at net.minecraft.server.MinecraftServer.n(SourceFile:292)
        at kx.run(SourceFile:605)

[10:15:16 ERROR]: Item entity 143 has no item?!
[10:15:16 ERROR]: Couldn't load chunk
s: Loading entity NBT
	at ql.f(SourceFile:1096) ~[minecraft_server.13w43a.jar:?]
	at qr.a(SourceFile:155) ~[minecraft_server.13w43a.jar:?]
	at aou.a(SourceFile:289) ~[minecraft_server.13w43a.jar:?]
	at aou.a(SourceFile:78) ~[minecraft_server.13w43a.jar:?]
	at aou.a(SourceFile:66) ~[minecraft_server.13w43a.jar:?]
	at mi.f(SourceFile:119) [minecraft_server.13w43a.jar:?]
	at mi.c(SourceFile:72) [minecraft_server.13w43a.jar:?]
	at net.minecraft.server.MinecraftServer.g(SourceFile:242) [minecraft_server.13w43a.jar:?]
	at net.minecraft.server.MinecraftServer.a(SourceFile:212) [minecraft_server.13w43a.jar:?]
	at lj.e(SourceFile:180) [minecraft_server.13w43a.jar:?]
	at net.minecraft.server.MinecraftServer.run(SourceFile:328) [minecraft_server.13w43a.jar:?]
	at ky.run(SourceFile:617) [minecraft_server.13w43a.jar:?]
Caused by: java.lang.NullPointerException
	at ro.b(SourceFile:132) ~[minecraft_server.13w43a.jar:?]
	at vu.a(SourceFile:247) ~[minecraft_server.13w43a.jar:?]
	at vu.a(SourceFile:189) ~[minecraft_server.13w43a.jar:?]
	at ql.f(SourceFile:1089) ~[minecraft_server.13w43a.jar:?]
	... 11 more