Erro

// Erro:

[18:10:40 ERROR]: Could not load 'plugins\iSystem.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.ExceptionInInitializerError
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:135) ~[Spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.
java:329) ~[Spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager
.java:251) [Spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugins(CraftServer.ja
va:292) [Spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.reload(CraftServer.java:73
9) [Spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.Bukkit.reload(Bukkit.java:535) [Spigot.jar:git-Spigot-db6d
e12-18fbb24]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:
25) [Spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:14
1) [Spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServe
r.java:641) [Spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchServerCommand(Craf
tServer.java:627) [Spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.aO(DedicatedServer.java:
412) [Spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:3
75) [Spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:6
54) [Spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java
:557) [Spigot.jar:git-Spigot-db6de12-18fbb24]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]
Caused by: java.lang.ExceptionInInitializerError
        at java.lang.Class.forName0(Native Method) ~[?:1.8.0_121]
        at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_121]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.jav
a:64) ~[Spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:131) ~[Spigot.jar:git-Spigot-db6de12-18fbb24]
        ... 14 more
Caused by: java.lang.IllegalStateException: Cannot get plugin for class me.ygor.
project.Main from a static initializer
        at org.bukkit.plugin.java.JavaPlugin.getPlugin(JavaPlugin.java:531) ~[Sp
igot.jar:git-Spigot-db6de12-18fbb24]
        at me.ygor.project.Config.<init>(Config.java:13) ~[?:?]
        at me.ygor.project.Main.<clinit>(Main.java:7) ~[?:?]
        at java.lang.Class.forName0(Native Method) ~[?:1.8.0_121]
        at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_121]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.jav
a:64) ~[Spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:131) ~[Spigot.jar:git-Spigot-db6de12-18fbb24]
        ... 14 more