[14:09:05 SEVERE]: Fatal error launching game. Report this to http://bugs.mojang.com please!
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
at java.util.ArrayList$Itr.next(Unknown Source)
at net.minecraft.launcher.updater.a.getInstalledVersions(Unknown Source)
at net.minecraft.launcher.Launcher.aK(Unknown Source)
at net.minecraft.launcher.game.a.B(Unknown Source)
at com.mojang.launcher.b.b.a.b(Unknown Source)
at com.mojang.launcher.updater.download.DownloadJob.popAndDownload(Unknown Source)
at com.mojang.launcher.updater.download.DownloadJob.access$0(Unknown Source)
at com.mojang.launcher.updater.download.DownloadJob$1.run(Unknown Source)
at java.util.concurrent.Executors$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)

[14:09:29 SEVERE]: Game ended with bad state (exit code -1073740940)
[14:09:29 INFO]: Ignoring visibility rule and showing launcher due to a game crash
[14:09:29 INFO]: Deleting C:\Users\ACER\AppData\Roaming\.minecraft\versions\1.10\1.10-natives-19595198280912
[14:09:29 WARNING]: Couldn't delete C:\Users\ACER\AppData\Roaming\.minecraft\versions\1.10\1.10-natives-19595198280912 - scheduling for deletion upon exit