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java.lang.ClassNotFoundException: net.minecraft.server.v1_17_R1.PacketPlayOutScoreboardTeam
[16:44:12] [Server thread/WARN]:        at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:142)
[16:44:12] [Server thread/WARN]:        at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:99)
[16:44:12] [Server thread/WARN]:        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
[16:44:12] [Server thread/WARN]:        at java.base/java.lang.Class.forName0(Native Method)
[16:44:12] [Server thread/WARN]:        at java.base/java.lang.Class.forName(Class.java:375)
[16:44:12] [Server thread/WARN]:        at net.dev.prefixsystem.utils.ReflectUtils.getNMSClass(ReflectUtils.java:32)
[16:44:12] [Server thread/WARN]:        at net.dev.prefixsystem.utils.TeamUtils.destroyTeam(TeamUtils.java:92)
[16:44:12] [Server thread/WARN]:        at net.dev.prefixsystem.utils.TeamUtils.updateTeams(TeamUtils.java:59)
[16:44:12] [Server thread/WARN]:        at net.dev.prefixsystem.PrefixSystem$1.run(PrefixSystem.java:89)
[16:44:12] [Server thread/WARN]:        at org.bukkit.craftbukkit.v1_17_R1.scheduler.CraftTask.run(CraftTask.java:82)
[16:44:12] [Server thread/WARN]:        at org.bukkit.craftbukkit.v1_17_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:415)
[16:44:12] [Server thread/WARN]:        at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1269)
[16:44:12] [Server thread/WARN]:        at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:438)
[16:44:12] [Server thread/WARN]:        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1217)
[16:44:12] [Server thread/WARN]:        at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:1050)
[16:44:12] [Server thread/WARN]:        at net.minecraft.server.MinecraftServer.lambda$0(MinecraftServer.java:305)
[16:44:12] [Server thread/WARN]:        at java.base/java.lang.Thread.run(Thread.java:831)
[16:44:12] [Server thread/WARN]: java.lang.NullPointerException
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    Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking.
    – Community
    Sep 7 at 14:55