[08:39:19 ERROR]: Could not load 'plugins/SpawnerDelay.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.IllegalArgumentException: Plugin already initialized!
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:326) ~[spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:248) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.loadPlugins(CraftServer.java:297) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.reload(CraftServer.java:742) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at org.bukkit.Bukkit.reload(Bukkit.java:525) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:25) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:640) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1385) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1220) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_112]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_112]
        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:747) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:405) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:678) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:576) [spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_112]
Caused by: java.lang.IllegalArgumentException: Plugin already initialized!
        at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:122) ~[spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:60) ~[spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at me.lib.main.Mainn.<init>(Mainn.java:20) ~[?:?]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_112]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_112]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_112]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_112]
        at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_112]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:76) ~[spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        ... 21 more
Caused by: java.lang.IllegalStateException: Initial initialization
        at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:125) ~[spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:60) ~[spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at me.lib.main.Mainn.<init>(Mainn.java:20) ~[?:?]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_112]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_112]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_112]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_112]
        at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_112]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:76) ~[spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot-1.12.jar:git-Spigot-596221b-b1b9ab0]
        ... 21 more