: Unhandled exception in thread ThreadĬom.圎xception: duplicate key: nullĪt .bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~Īt .bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~Īt .bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~Īt .bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~Īt .fromJson(Gson.java:795) ~Īt .fromJson(Gson.java:761) ~Īt .fromJson(Gson.java:710) ~Īt .fromJson(Gson.java:682) ~Īt .RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~Īt .MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~Īt .MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~Īt .(AbstractGameRunner.java:67) ~Īt .GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~Īt .runWorker(ThreadPoolExecutor.java:1142) ~Īt $n(ThreadPoolExecutor.java:617) ~Īt java.lang. In the launcher log, I see a stack trace as follows: When I press the "Play" button I see the message "Preparing.", and nothing else happens. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. I use the old Java launcher because the new one does not work on my Linux distribution. I'm aware that this workaround is very tedious and hard to follow, but it's the only one that is found to work on computers that can't use the new launcher as of now. Instead, I've opened a thread on Reddit if you need support. If you have trouble following these steps above, please do not comment on this ticket.
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