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I was playing on the FTB launcher, but got bored so I decided to play vanilla 1.8.3. I tried to open my account but it keeps crashing with the log,



[18:31:59] [Client thread/INFO]: Setting user: zachthelamp
[18:31:59] [Client thread/INFO]: (Session ID is token:9b450dea6abc4173a98a7fe0cd3abdd7:d8dfc08c14b243fdb59d2c6677cd54cf)
Exception in thread "Client thread" com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 16310
at com.google.gson.Gson.assertFullConsumption(Gson.java:779)
at com.google.gson.Gson.fromJson(Gson.java:769)
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: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 16310
at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1505)
at com.google.gson.stream.JsonReader.checkLenient(JsonReader.java:1386)
at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:531)
at com.google.gson.stream.JsonReader.peek(JsonReader.java:414)
at com.google.gson.Gson.assertFullConsumption(Gson.java:775)
... 7 more



Does anyone know what's wrong? Thanks

corrupted json file. If you have %appdata%/.minecraft/usercache.json you could try deleting it.

Quote from gerbil»

corrupted json file. If you have %appdata%/.minecraft/usercache.json you could try deleting it.

Where exactly would I find that if I had it?

exactly at %appdata%/.minecraft/usercache.json