[02:37:27] [Server thread/ERROR]: Could not pass event PlayerJoinEvent to QuickSell v1.10.9
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[spigot.jar:git-Spigot-8a983f9-e81edfc]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-8a983f9-e81edfc]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-8a983f9-e81edfc]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-8a983f9-e81edfc]
	at net.minecraft.server.v1_8_R1.PlayerList.onPlayerJoin(PlayerList.java:272) [spigot.jar:git-Spigot-8a983f9-e81edfc]
	at net.minecraft.server.v1_8_R1.PlayerList.a(PlayerList.java:156) [spigot.jar:git-Spigot-8a983f9-e81edfc]
	at net.minecraft.server.v1_8_R1.LoginListener.b(LoginListener.java:109) [spigot.jar:git-Spigot-8a983f9-e81edfc]
	at net.minecraft.server.v1_8_R1.LoginListener.c(LoginListener.java:41) [spigot.jar:git-Spigot-8a983f9-e81edfc]
	at net.minecraft.server.v1_8_R1.NetworkManager.a(NetworkManager.java:159) [spigot.jar:git-Spigot-8a983f9-e81edfc]
	at net.minecraft.server.v1_8_R1.ServerConnection.c(ServerConnection.java:82) [spigot.jar:git-Spigot-8a983f9-e81edfc]
	at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:800) [spigot.jar:git-Spigot-8a983f9-e81edfc]
	at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316) [spigot.jar:git-Spigot-8a983f9-e81edfc]
	at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:634) [spigot.jar:git-Spigot-8a983f9-e81edfc]
	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:537) [spigot.jar:git-Spigot-8a983f9-e81edfc]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_05]
Caused by: java.lang.NoClassDefFoundError: me/mrCookieSlime/CSCoreLibPlugin/general/Math/DoubleHandler
	at me.mrCookieSlime.QuickSell.boosters.Booster.getMultiplier(Booster.java:197) ~[?:?]
	at me.mrCookieSlime.QuickSell.QuickSell.updateScoreboard(QuickSell.java:425) ~[?:?]
	at me.mrCookieSlime.QuickSell.SellListener.onJoin(SellListener.java:209) ~[?:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_05]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_05]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_05]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_05]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301) ~[spigot.jar:git-Spigot-8a983f9-e81edfc]
	... 14 more
Caused by: java.lang.ClassNotFoundException: me.mrCookieSlime.CSCoreLibPlugin.general.Math.DoubleHandler
	at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_05]
	at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_05]
	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_05]
	at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_05]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot.jar:git-Spigot-8a983f9-e81edfc]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-8a983f9-e81edfc]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_05]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_05]
	at me.mrCookieSlime.QuickSell.boosters.Booster.getMultiplier(Booster.java:197) ~[?:?]
	at me.mrCookieSlime.QuickSell.QuickSell.updateScoreboard(QuickSell.java:425) ~[?:?]
	at me.mrCookieSlime.QuickSell.SellListener.onJoin(SellListener.java:209) ~[?:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_05]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_05]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_05]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_05]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301) ~[spigot.jar:git-Spigot-8a983f9-e81edfc]