When I Launch My Minecraft It Says:
Error opening zip file or JAR manifest missing : libraries/io/netty/NettyAgent-1.0.jar
Error occurred during initialization of VM
agent library failed to init: instrument
MCL-8242
My Minecraft Constantly Crashes
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Try closing the launcher and deleting
[minecraft|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder]/libraries, then try again.