Помогите Что это за ошибка?

Error occurred while enabling FootballCraft v1.0 (Is it up to date?)
java.lang.IllegalArgumentException: Plugin already initialized!
at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:98) ~[craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:60) ~[craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at ru.romesyt.footbalplug.FootballPlug.<init>(FootballPlug.java:9) ~[?:?]
at ru.romesyt.footbalplug.Protecter.<init>(Protecter.java:24) ~[?:?]
at ru.romesyt.footbalplug.FootballPlug.onEnable(FootballPlug.java:34) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:329) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:401) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:360) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:321) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.t(MinecraftServer.java:411) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.l(MinecraftServer.java:372) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.a(MinecraftServer.java:327) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:248) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:521) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_144]
Caused by: java.lang.IllegalStateException: Initial initialization
at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:101) ~[craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:60) ~[craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at ru.romesyt.footbalplug.FootballPlug.<init>(FootballPlug.java:9) ~[?:?]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_144]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_144]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_144]
at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_144]
at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_144]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:52) ~[craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:127) ~[craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:325) ~[craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:248) ~[craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.loadPlugins(CraftServer.java:296) ~[craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:188) ~[craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
... 2 more
[15:25:09] [Server thread/INFO]: Server permissions file permissions.yml is empty, ignoring it