Minecraft Forums

Hello, and my minecraft launcher wan't start minecraft. When I look at "Development Console" it will say:
[10:32:39 ERROR]: Couldn't unpack natives!
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method) ~[?:1.7.0_40]
at java.util.zip.ZipFile.<init>(Unknown Source) ~[?:1.7.0_40]
at java.util.zip.ZipFile.<init>(Unknown Source) ~[?:1.7.0_40]
at java.util.zip.ZipFile.<init>(Unknown Source) ~[?:1.7.0_40]
at net.minecraft.launcher.GameLauncher.unpackNatives(GameLauncher.java:469) ~[launcher.jar:?]
at net.minecraft.launcher.GameLauncher.launchGame(GameLauncher.java:213) [launcher.jar:?]
at net.minecraft.launcher.GameLauncher.onDownloadJobFinished(GameLauncher.java:619) [launcher.jar:?]
at net.minecraft.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:120) [launcher.jar:?]
at net.minecraft.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12) [launcher.jar:?]
at net.minecraft.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:89) [launcher.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.7.0_40]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_40]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.7.0_40]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.7.0_40]
at java.lang.Thread.run(Unknown Source) [?:1.7.0_40]

Can anyone help?