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I cant use my minecraft, if i try to launch it this is what i see:











[08:09:54] [Client thread/INFO]: Setting user: maxthekitty
[08:09:54] [Client thread/INFO]: (Session ID is token:ce73b0f04ec6483f9edaa19c2fc8999a:0e40f30099be41f7b9fcacfa1da91b52)
Exception in thread "Client thread" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was STRING at line 1 column 1
at com.google.gson.Gson.fromJson(Gson.java:815)
at com.google.gson.Gson.fromJson(Gson.java:768)
at lu.b(SourceFile:151)
at lu.<init>(SourceFile:43)
at net.minecraft.server.MinecraftServer.<init>(SourceFile:155)
at bpp.<init>(SourceFile:41)
at avf.<init>(SourceFile:293)
at net.minecraft.client.main.Main.main(SourceFile:124)
Caused by: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was STRING at line 1 column 1
at com.google.gson.stream.JsonReader.beginArray(JsonReader.java:338)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:79)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60)
at com.google.gson.Gson.fromJson(Gson.java:803)
... 7 more
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

"Some of the .json files in the minecraft installation or in the world are broken." Delete everything in you .minecraft folder except for the saves. Run Minecraft again. It should work.

@toastdude78 is right. ALWAYS delete everything but saves, resourcepacks, and mods if everything else fails.