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
Comments

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

Hey is there anything I can do at all?
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.

Excuse me where is the Minecraft data folder located

Never mind

Thank you Neko your idea worked thanks a lot
What version of Minecraft was this?