hs startup error

[11:35:42] [Server thread/ERROR]: Error occurred while enabling HackedServer v2.54.1 (Is it up to date?)
java.lang.ExceptionInInitializerError: null
	at io.th0rgal.hackedserver.events.EventsManager.registerEvents(EventsManager.java:32) ~[?:?]
	at io.th0rgal.hackedserver.Core.onEnable(Core.java:89) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[patched_1.15.2.jar:git-Paper-284]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:364) ~[patched_1.15.2.jar:git-Paper-284]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:483) ~[patched_1.15.2.jar:git-Paper-284]
	at org.bukkit.craftbukkit.v1_15_R1.CraftServer.enablePlugin(CraftServer.java:472) ~[patched_1.15.2.jar:git-Paper-284]
	at org.bukkit.craftbukkit.v1_15_R1.CraftServer.enablePlugins(CraftServer.java:386) ~[patched_1.15.2.jar:git-Paper-284]
	at net.minecraft.server.v1_15_R1.MinecraftServer.a(MinecraftServer.java:488) ~[patched_1.15.2.jar:git-Paper-284]
	at net.minecraft.server.v1_15_R1.DedicatedServer.init(DedicatedServer.java:298) ~[patched_1.15.2.jar:git-Paper-284]
	at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:897) ~[patched_1.15.2.jar:git-Paper-284]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_251]
Caused by: java.lang.IllegalStateException: Unable to find method null ([class net.minecraft.server.v1_15_R1.ServerConnection]).
	at io.th0rgal.hackedserver.utils.tinyprotocol.Reflection.getTypedMethod(Reflection.java:242) ~[?:?]
	at io.th0rgal.hackedserver.utils.tinyprotocol.Reflection.getMethod(Reflection.java:203) ~[?:?]
	at io.th0rgal.hackedserver.utils.tinyprotocol.Reflection.getTypedMethod(Reflection.java:240) ~[?:?]
	at io.th0rgal.hackedserver.utils.tinyprotocol.TinyProtocol.<clinit>(TinyProtocol.java:56) ~[?:?]
	... 11 more
[11:35:42] [Server thread/INFO]: [HackedServer] Disabling HackedServer v2.54.1