Minecraft Problem

[18:15:47 INFO]: Attempting to download C:\Users\Meraj Ahmed\AppData\Roaming\.minecraft\assets\objects\47\47800737d078e751698df291054adc596ba8195a for job 'Resources'... (try 1)
[18:16:17 WARN]: Couldn't download http://resources.download.minecraft.net/47/47800737d078e751698df291054adc596ba8195a for job 'Resources'
java.lang.RuntimeException: Hash did not match downloaded file (Expected 47800737d078e751698df291054adc596ba8195a, downloaded 8f70ad98461f81dab56be2e675f5734e9d037f18)
	at net.minecraft.launcher.updater.download.assets.AssetDownloadable.download(AssetDownloadable.java:48) ~[launcher_mcpatched.jar:?]
	at net.minecraft.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:108) [launcher_mcpatched.jar:?]
	at net.minecraft.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12) [launcher_mcpatched.jar:?]
	at net.minecraft.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:89) [launcher_mcpatched.jar:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.7.0_45]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_45]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.7.0_45]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.7.0_45]
	at java.lang.Thread.run(Unknown Source) [?:1.7.0_45]