The getsockopt error is a network issue in Minecraft that is usually caused by firewall blocks, DNS problems, or an unstable internet connection. The quick fixes ...
On the next run, the method sees the file exists and skips re-downloading → ClassNotFoundException: com.manticore.h2.H2MigrationTool. Fix: Manually download H2MigrationTool-1.8-all.jar and the H2 jars ...
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