If a user attempts to log in with a Mojang Studios or legacy Minecraft account, they will be directed to migrate to a Microsoft account. Subsequent logins can be done in the "Settings" tab. On the initial login screen, users must log in with a pre-existing Microsoft account, otherwise they can create a new one by clicking the link. 7 Uninstalling the old Minecraft Unified Launcher.I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail. : 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. Edit your launcher profile and select the version you just installed, for instance 1.14.4-fix.Delete the first downloads object ("downloads", and everything inside of the curly braces behind).Edit the "id": "" field so that it now has the same name as you gave the version, for instance "id": "1.14.4-fix".json file in a text editor of your choice. For instance, for 1.14.4, that would be 1.14.4-fix.json. json file you downloaded in that folder as well, and rename it so that it has the same name. For instance, for 1.14.4, that would be 1.14.4-fix.jar. Copy the client.jar file into the folder you just created and rename it so that it has the same name as the folder.
#Minecraft jar launcher install
For instance, I would recommend to use 1.14.4-fix if you want to install 1.14.4. You may choose a custom name, but not the name of any vanilla version.
#Minecraft jar launcher download
json" links to download a client.jar file, and a. Click the "Download → Client" and "Download →. Here, you find links to download the version files directly from Mojang's servers.
(Beware of pirated third-party launchers though, they might steal your login data.) If you can use the updated launcher, or a third party launcher (such as MultiMC), you might want to use those. To work around this issue, you can install versions you want to play manually. It happens because the legacy launcher does seem to have problems with downloading and installing the newer version files. This is an error that occurs only when launching 1.14.4, 19w36a, or versions that have been released after 19w36a. It is recommended to use the updated launcher (legacy or not) instead of using the workaround below. You find the workaround for this issue that could be used before it was fixed below. If you're not able to launch the 2.x.x launcher, please create a new ticket about that.
You can find the download links for it here.
#Minecraft jar launcher update
If you're able to launch the updated launcher (2.x.x), it is recommended to update to this one instead. If your launcher does not automatically update, you can download the updated version (1.6.93) here. A new version of the legacy launcher has been released that solves this issue.
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