error to launch

C:\Users\user\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.7.6\realms-1.7.6.jar
at net.minecraft.launcher.GameLauncher.constructClassPath(GameLauncher.java:598)
at net.minecraft.launcher.GameLauncher.launchGame(GameLauncher.java:416)
at net.minecraft.launcher.GameLauncher.onDownloadJobFinished(GameLauncher.java:699)
at net.minecraft.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:124)
at net.minecraft.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:15)
at net.minecraft.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:94)
at java.util.concurrent.Executors$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)