[12:32:07 ERROR]: Error occurred while enabling QuantumRPG v4.2.5 (Is it up to date?)
java.lang.NoClassDefFoundError: me/leothepro555/skills/main/Skills
        at su.nightexpress.quantumrpg.hooks.external.SkillsHook.setup(SkillsHook.java:39) ~[?:?]
        at su.jupiter44.jcore.hooks.JHook.hook(JHook.java:21) ~[?:?]
        at su.jupiter44.jcore.hooks.HookManager.setup(HookManager.java:101) ~[?:?]
        at su.jupiter44.jcore.JPlugin.loadManagers(JPlugin.java:203) ~[?:?]
        at su.jupiter44.jcore.JPlugin.onEnable(JPlugin.java:101) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:265) ~[spigot.jar:git-Spigot-1a3504a-dfa7583]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:347) [spigot.jar:git-Spigot-1a3504a-dfa7583]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:410) [spigot.jar:git-Spigot-1a3504a-dfa7583]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.enablePlugin(CraftServer.java:436) [spigot.jar:git-Spigot-1a3504a-dfa7583]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.enablePlugins(CraftServer.java:350) [spigot.jar:git-Spigot-1a3504a-dfa7583]
        at net.minecraft.server.v1_13_R2.MinecraftServer.l(MinecraftServer.java:580) [spigot.jar:git-Spigot-1a3504a-dfa7583]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:542) [spigot.jar:git-Spigot-1a3504a-dfa7583]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:420) [spigot.jar:git-Spigot-1a3504a-dfa7583]
        at net.minecraft.server.v1_13_R2.DedicatedServer.init(DedicatedServer.java:294) [spigot.jar:git-Spigot-1a3504a-dfa7583]
        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:698) [spigot.jar:git-Spigot-1a3504a-dfa7583]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_211]
Caused by: java.lang.ClassNotFoundException: me.leothepro555.skills.main.Skills
        at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_211]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:136) ~[spigot.jar:git-Spigot-1a3504a-dfa7583]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:82) ~[spigot.jar:git-Spigot-1a3504a-dfa7583]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_211]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_211]
        ... 16 more