Bug of Versions or the Launcher.

com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unterminated string at line 513 column 12
	at com.google.gson.Gson.fromJson(Gson.java:818) ~[Minecraft%20(2).jar:?]
	at com.google.gson.Gson.fromJson(Gson.java:768) ~[Minecraft%20(2).jar:?]
	at com.google.gson.Gson.fromJson(Gson.java:717) ~[Minecraft%20(2).jar:?]
	at com.google.gson.Gson.fromJson(Gson.java:689) ~[Minecraft%20(2).jar:?]
	at net.minecraft.launcher.game.MinecraftGameRunner.reconstructAssets(MinecraftGameRunner.java:249) ~[launcher_mcpatched.jar:?]
	at net.minecraft.launcher.game.MinecraftGameRunner.launchGame(MinecraftGameRunner.java:115) ~[launcher_mcpatched.jar:?]
	at com.mojang.launcher.game.runner.AbstractGameRunner.onDownloadJobFinished(AbstractGameRunner.java:177) [launcher_mcpatched.jar:?]
	at com.mojang.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:122) [launcher_mcpatched.jar:?]
	at com.mojang.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12) [launcher_mcpatched.jar:?]
	at com.mojang.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:86) [launcher_mcpatched.jar:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.7.0_60]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_60]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.7.0_60]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.7.0_60]
	at java.lang.Thread.run(Unknown Source) [?:1.7.0_60]
Caused by: com.google.gson.stream.MalformedJsonException: Unterminated string at line 513 column 12
	at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1505) ~[Minecraft%20(2).jar:?]
	at com.google.gson.stream.JsonReader.nextQuotedValue(JsonReader.java:1006) ~[Minecraft%20(2).jar:?]
	at com.google.gson.stream.JsonReader.nextName(JsonReader.java:783) ~[Minecraft%20(2).jar:?]
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:167) ~[Minecraft%20(2).jar:?]
	at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40) ~[Minecraft%20(2).jar:?]
	at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:187) ~[Minecraft%20(2).jar:?]
	at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:1) ~[Minecraft%20(2).jar:?]
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft%20(2).jar:?]
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft%20(2).jar:?]
	at com.google.gson.Gson.fromJson(Gson.java:803) ~[Minecraft%20(2).jar:?]
	... 14 more