![]() Native path:C:/Users/marc/Desktop/MultiMC/instances/1.14.41/natives Java is version 1.8.0_221, using 64-bit architecture. Java path is:C:/Program Files/Java/jre1.8.0_221/bin/javaw.exe Minecraft folder is:C:/Users/WINDOWSXP/Desktop/MultiMC/instances/1.14.41/.minecraft The problem is that I keep trying to start up Minecraft 1.14.4 with these mods:Īnd I don't understand the console log, so here you go: Hello! I'm having a problem with MultiMC! MultiMC/libraries/org/apache/logging/log4j/log4j-core/2.14.1/log4j-core-2.14.1.Extra info after I disabled the Fabric API. ![]() MultiMC/libraries/org/apache/logging/log4j/log4j-core/2.0-beta9-fixed/ MultiMC/libraries/org/apache/logging/log4j/log4j-api/2.0-beta9-fixed/ When starting up an instance, the log4j library versions should be either 2.16.0 or 2.0-beta9-fixed. ![]() If the customized versions came with a modpack and you’re not sure how to proceed, contact the modpack author(s) or look for any instructions they may have published.Ĭheck the logs during start to be absolutely sure. If you actually customized your versions on purpose, you will have to redo that with the updated log4j libraries. If Minecraft, Forge, Liteloader or Fabric have (Custom) in their version like this, select them and press Revert. You may have done this without realizing, so go check: Make sure you haven’t customized Minecraft/Liteloader/Forge/Fabric versions in the instance Version page(s).Ĭustomized versions will not automatically update. MultiMC needs to download new files to actually apply the fixes. Start all your instances in online mode at least once. Restarting it will make it check for updates to all those versions again. While MultiMC is running, it remembers the descriptions of versions it has seen during that session. We cannot vouch for anything that comes from sources other than .įully restart MultiMC to make it load fresh version metadata. Make sure you are actually running MultiMC and not some third party fork. While the defaults are safe, there are some things you can do to ensure this is true in your case. Force all mod loaders installed through MultiMC to not bundle any version of log4j.Įffectively, if you use MultiMC and haven’t done anything unusual with it, you should be safe.Force old version of Minecraft to use a patched version of log4j 2.0-beta9, which has this issue fixed.Force all modern versions of Minecraft to use log4j 2.15.0 or newer, which doesn’t have this issue.MultiMC has a system to automatically update game and mod loader versions. NOTE: log4j has been further updated to 2.16.0.ĭo not be alarmed by the change from 2.15.0. ![]() Hello, you may have seen all kinds of chaos and misunderstanding related to a security bug in log4j that can allow attackers to run code on your machine.Īll versions of the game that use an unpatched or old version of the log4j library are susceptible to attacks - if you are running a server, or are connecting to one.
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