Minecraft Forums

Exception in thread "main" com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unterminated array at line 1 column 28
at com.google.gson.internal.Streams.parse(Streams.java:56)
at com.google.gson.TreeTypeAdapter.read(TreeTypeAdapter.java:54)
at com.google.gson.Gson.fromJson(Gson.java:803)
at com.google.gson.Gson.fromJson(Gson.java:768)
at com.google.gson.Gson.fromJson(Gson.java:717)
at com.google.gson.Gson.fromJson(Gson.java:689)
at net.minecraft.client.main.Main.main(Main.java)
Caused by: com.google.gson.stream.MalformedJsonException: Unterminated array at line 1 column 28
at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1505)
at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:465)
at com.google.gson.stream.JsonReader.hasNext(JsonReader.java:403)
at com.google.gson.internal.bind.TypeAdapters$25.read(TypeAdapters.java:658)
at com.google.gson.internal.bind.TypeAdapters$25.read(TypeAdapters.java:667)
at com.google.gson.internal.bind.TypeAdapters$25.read(TypeAdapters.java:642)
at com.google.gson.internal.Streams.parse(Streams.java:44)
... 6 more
Java HotSpot(TM) Client VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Reinstall MC from scratch.