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java.lang.RuntimeException: Server responded with 503	at net.minecraft.launcher.updater.download.assets.AssetDownloadable.download(AssetDownloadable.java:53)	at net.minecraft.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:107)	at net.minecraft.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12)	at net.minecraft.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:89)	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)	at java.util.concurrent.FutureTask.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)