cannot load minecraft

[13:56:31] [Client thread/INFO]: Setting user: stijnenyannick
[13:56:31] [Client thread/INFO]: (Session ID is token:df1833acec2a45e4b63ec04e21110c2f:92e4849ef55a46e1a6d0c3188e51592b)
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

What I expected to happen was...:
Minecraft to load

Describe what you thought should happen here
For minecraft to load

What actually happened was...:
It didnt load

Describe what happened here
It didnt load....... , see report om ttop

Steps to Reproduce:
1. i press start and i get the screen you see on top ,
2. ...
3. ...