Bukkit

When i try to start my server i get this error
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java.lang.NoSuchFieldError: completionKey
at sun.nio.fs.WindowsNativeDispatcher.initIDs(Native Method)
at sun.nio.fs.WindowsNativeDispatcher.<clinit>(Unknown Source)
at sun.nio.fs.WindowsLinkSupport.getRealPath(Unknown Source)
at sun.nio.fs.WindowsPath.toRealPath(Unknown Source)
at sun.nio.fs.WindowsPath.toRealPath(Unknown Source)
at sun.util.calendar.ZoneInfoFile$1.run(Unknown Source)
at sun.util.calendar.ZoneInfoFile$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.util.calendar.ZoneInfoFile.<clinit>(Unknown Source)
at sun.util.calendar.ZoneInfo.getTimeZone(Unknown Source)
at java.util.TimeZone.getTimeZone(Unknown Source)
at java.util.TimeZone.setDefaultZone(Unknown Source)
at java.util.TimeZone.getDefaultRef(Unknown Source)
at java.util.TimeZone.getDefault(Unknown Source)
at java.text.SimpleDateFormat.initializeCalendar(Unknown Source)
at java.text.SimpleDateFormat.<init>(Unknown Source)
at java.text.SimpleDateFormat.<init>(Unknown Source)
at org.apache.logging.log4j.status.StatusData.getFormattedStatus(StatusD
ata.java:101)
at org.apache.logging.log4j.core.jmx.StatusLoggerAdmin.log(StatusLoggerA
dmin.java:105)
at org.apache.logging.log4j.status.StatusLogger.log(StatusLogger.java:19
4)
at org.apache.logging.log4j.spi.AbstractLogger.warn(AbstractLogger.java:
1918)
at org.apache.logging.log4j.LogManager.<clinit>(LogManager.java:114)
at net.minecraft.server.v1_7_R3.MinecraftServer.<clinit>(MinecraftServer
.java:47)
at org.bukkit.craftbukkit.Main.main(Main.java:159)