[MCL-5143] I can not start up my minecraft launcher for some reason(vanilla

Completely ignored arguments: [--nativeLauncherVersion, 307]
[19:33:44] [Client thread/INFO]: Setting user: killergrzjr
[19:33:44] [Client thread/INFO]: (Session ID is <censored>)
Exception in thread "Client thread" java.lang.NullPointerException
	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:213)
	at com.google.common.collect.Lists$ReverseList.<init>(Lists.java:767)
	at com.google.common.collect.Lists.reverse(Lists.java:759)
	at lt.b(SourceFile:156)
	at lt.<init>(SourceFile:43)
	at net.minecraft.server.MinecraftServer.<init>(SourceFile:155)
	at bpo.<init>(SourceFile:41)
	at ave.<init>(SourceFile:293)
	at net.minecraft.client.main.Main.main(SourceFile:124)
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Linked issues

duplicates

MC-79947 Starting game fails with error "com.google.common.base.Preconditions.checkNotNull" (corruped usercache.json)

Comments

[Mod] Neko 2016-12-06T00:39:15Z

What version of Minecraft was this?

migrated 2016-12-06T00:40:16Z

at first it was 1.8.9 but then a friend of mine suggested I try 1.8.8 and so on all the way to 1.8

migrated 2016-12-06T01:07:06Z

Hey is there anything I can do at all?

[Mod] Neko 2016-12-06T01:24:25Z

You can try renaming or deleting the usercache.json file in your [Minecraft data folder|http://hopper.minecraft.net/help/finding-minecraft-data-folder], as it may have been corrupted.

migrated 2016-12-06T02:18:58Z

Excuse me where is the Minecraft data folder located

migrated 2016-12-06T02:20:01Z

Never mind

migrated 2016-12-06T02:21:57Z

Thank you Neko your idea worked thanks a lot