Minecraft problémám akadt, mit kéne tennem?

[10:13:53 FATAL]: Unhandled exception in thread Thread[pool-2-thread-4,5,main]

com.google.gson.JsonSyntaxException: duplicate key: null

at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:190) ~[Shiginima%20Launcher%20SE%20v4200.exe:v1.0]

at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:145) ~[Shiginima%20Launcher%20SE%20v4200.exe:v1.0]

at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Shiginima%20Launcher%20SE%20v4200.exe:v1.0]

at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Shiginima%20Launcher%20SE%20v4200.exe:v1.0]

at com.google.gson.Gson.fromJson(Gson.java:803) ~[Shiginima%20Launcher%20SE%20v4200.exe:v1.0]

at com.google.gson.Gson.fromJson(Gson.java:768) ~[Shiginima%20Launcher%20SE%20v4200.exe:v1.0]

at com.google.gson.Gson.fromJson(Gson.java:717) ~[Shiginima%20Launcher%20SE%20v4200.exe:v1.0]

at com.google.gson.Gson.fromJson(Gson.java:689) ~[Shiginima%20Launcher%20SE%20v4200.exe:v1.0]

at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:40) ~[Shiginima%20Launcher%20SE%20v4200.exe:v1.0]

at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:240) ~[Shiginima%20Launcher%20SE%20v4200.exe:v1.0]

at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:47) ~[Shiginima%20Launcher%20SE%20v4200.exe:v1.0]

at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:74) ~[Shiginima%20Launcher%20SE%20v4200.exe:v1.0]

at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:128) ~[Shiginima%20Launcher%20SE%20v4200.exe:v1.0]

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) ~[?:1.8.0_221]

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) ~[?:1.8.0_221]

at java.lang.Thread.run(Unknown Source) [?:1.8.0_221]

ezt a hibaüzenetet kapom belépésnél.