This Shows Up with All pre Releases And Snapshots.
[12:31:17] [Client thread/INFO]: Setting user: AC_Boomstick
[12:31:17] [Client thread/INFO]: (Session ID is token:798a830bf9b94d5381470e8274c3eec4:036e92b171524f9ab86cf9120ceb5952)
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 ry.b(SourceFile:148)
at ry.<init>(SourceFile:42)
at net.minecraft.server.MinecraftServer.<init>(SourceFile:155)
at cyd.<init>(SourceFile:40)
at bsr.<init>(SourceFile:281)
at net.minecraft.client.main.Main.main(SourceFile:120)
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
This issue is a duplicate of MC-51590. It has been linked to the original bugreport.
Please search before reporting any bugs, as it's likely that one exists already.
Please do not mark unreleased versions (anything starting with "Future Version") as affected. You don't have access to them yet.