il ne lance pas MineCraft mes s'arrète aprêt le téléchargement

java.lang.RuntimeException: Server responded with 499
at net.minecraft.launcher.updater.download.assets.AssetDownloadable.download(AssetDownloadable.java:53) ~[launcher.jar:?]
at net.minecraft.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:107) [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]
[18:13:10 WARN]: Couldn't download http://resources.download.minecraft.net/ad/ad7d770b7fff3b64121f75bd60cecfc4866d1cd6 for job 'Resources'