[02:54:27 INFO]: Job 'Version & Libraries' finished successfully (took 0:00:00.133)
[02:54:27 INFO]: Launching game
[02:54:27 INFO]: Looking for old natives & assets to clean up...
[02:54:27 INFO]: Unpacking natives to C:\Users\lSebastia\AppData\Roaming\.minecraft\versions\1.7.4\1.7.4-natives-7067686415610
[02:54:27 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_21]
at java.util.zip.ZipFile.<init>(Unknown Source) ~[?:1.7.0_21]
at java.util.zip.ZipFile.<init>(Unknown Source) ~[?:1.7.0_21]
at java.util.zip.ZipFile.<init>(Unknown Source) ~[?:1.7.0_21]
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_21]
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) [?:1.7.0_21]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_21]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.7.0_21]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.7.0_21]
at java.lang.Thread.run(Unknown Source) [?:1.7.0_21]