[21:27:45] [Server thread/ERROR]: Could not load 'plugins\PreciousStones.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.IllegalArgumentException: Plugin already initialized!
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) ~[minecraft_server.jar:git-Spigot-952179b-bbf72f3]
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[minecraft_server.jar:git-Spigot-952179b-bbf72f3]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [minecraft_server.jar:git-Spigot-952179b-bbf72f3]
	at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugins(CraftServer.java:291) [minecraft_server.jar:git-Spigot-952179b-bbf72f3]
	at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:152) [minecraft_server.jar:git-Spigot-952179b-bbf72f3]
	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:494) [minecraft_server.jar:git-Spigot-952179b-bbf72f3]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_25]
Caused by: java.lang.IllegalArgumentException: Plugin already initialized!
	at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:122) ~[minecraft_server.jar:git-Spigot-952179b-bbf72f3]
	at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:66) ~[minecraft_server.jar:git-Spigot-952179b-bbf72f3]
	at net.sacredlabyrinth.Phaed.PreciousStones.PreciousStones.<init>(PreciousStones.java:24) ~[?:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_25]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_25]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_25]
	at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_25]
	at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_25]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:76) ~[minecraft_server.jar:git-Spigot-952179b-bbf72f3]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[minecraft_server.jar:git-Spigot-952179b-bbf72f3]
	... 6 more
Caused by: java.lang.IllegalStateException: Initial initialization
	at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:125) ~[minecraft_server.jar:git-Spigot-952179b-bbf72f3]
	at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:66) ~[minecraft_server.jar:git-Spigot-952179b-bbf72f3]
	at com.vk2gpz.mypreciousstone.MyPreciousStone.<init>(MyPreciousStone.java:20) ~[?:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_25]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_25]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_25]
	at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_25]
	at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_25]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:76) ~[minecraft_server.jar:git-Spigot-952179b-bbf72f3]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[minecraft_server.jar:git-Spigot-952179b-bbf72f3]
	... 6 more