[Server Will not start]

Hi ive made a couple of servers before, but this time i keep getting the same error. i run the launcher and all i get is this 

 

 

C:UsersPlascenciaDesktoptekkitserver>java -Xmx3G -Xms2G -jar Tekkit.jar nogu

i

A problem occurred running the Server launcher.java.lang.reflect.InvocationTarge

tException

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

        at java.lang.reflect.Method.invoke(Unknown Source)

        at cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.j

ava:48)

        at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.

java:17)

Caused by: 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.Calendar.getInstance(Unknown Source)

        at java.util.Formatter$FormatSpecifier.printDateTime(Unknown Source)

        at java.util.Formatter$FormatSpecifier.print(Unknown Source)

        at java.util.Formatter.format(Unknown Source)

        at java.util.Formatter.format(Unknown Source)

        at java.lang.String.format(Unknown Source)

        at java.util.logging.SimpleFormatter.format(Unknown Source)

        at java.util.logging.StreamHandler.publish(Unknown Source)

        at java.util.logging.ConsoleHandler.publish(Unknown Source)

        at java.util.logging.Logger.log(Unknown Source)

        at java.util.logging.Logger.doLog(Unknown Source)

        at java.util.logging.Logger.log(Unknown Source)

        at net.minecraft.launchwrapper.LogWrapper.log(LogWrapper.java:29)

        at net.minecraft.launchwrapper.Launch.launch(Launch.java:90)

        at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

        ... 6 more

 

C:UsersPlascenciaDesktoptekkitserver>pause

Press any key to continue . . .

 

 

i have no idea what it means or how to fix it :/ help would be much appreciated