Crash

Always crashes when I log in And with all early versions I cant play single player plz help! crash re port

[16:11:44] [Client thread/INFO]: Setting user: BatmanLives001
[16:11:44] [Client thread/INFO]: (Session ID is token:b52cb41f4d8f4429afa85f110f3e9466:6c6b23bf34204984bf9c3f23e052f4ea)
Exception in thread "Client thread" com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unterminated object at line 1 column 8196
	at com.google.gson.internal.Streams.parse(Streams.java:56)
	at com.google.gson.TreeTypeAdapter.read(TreeTypeAdapter.java:54)
	at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40)
	at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:81)
	at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60)
	at com.google.gson.Gson.fromJson(Gson.java:803)
	at com.google.gson.Gson.fromJson(Gson.java:768)
	at sa.b(SourceFile:148)
	at sa.<init>(SourceFile:42)
	at net.minecraft.server.MinecraftServer.<init>(SourceFile:155)
	at cyk.<init>(SourceFile:41)
	at bst.<init>(SourceFile:289)
	at net.minecraft.client.main.Main.main(SourceFile:124)
Caused by: com.google.gson.stream.MalformedJsonException: Unterminated object at line 1 column 8196
	at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1505)
	at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:480)
	at com.google.gson.stream.JsonReader.hasNext(JsonReader.java:403)
	at com.google.gson.internal.bind.TypeAdapters$25.read(TypeAdapters.java:666)
	at com.google.gson.internal.bind.TypeAdapters$25.read(TypeAdapters.java:642)
	at com.google.gson.internal.Streams.parse(Streams.java:44)
	... 12 more