2012-03-20 16:39:56 [SEVERE] Could not load 'plugins/boosCooldowns.jar' in folder 'plugins'

org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: org/bukkit/event/player/PlayerListener

	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:148)

	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:287)

	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:211)

	at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:207)

	at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:183)

	at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationManager.java:56)

	at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:156)

	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:425)

	at net.minecraft.server.ThreadServerApplication.run(SourceFile:490)

Caused by: java.lang.NoClassDefFoundError: org/bukkit/event/player/PlayerListener

	at java.lang.ClassLoader.defineClass1(Native Method)

	at java.lang.ClassLoader.defineClass(ClassLoader.java:791)

	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

	at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)

	at java.net.URLClassLoader.access$100(URLClassLoader.java:71)

	at java.net.URLClassLoader$1.run(URLClassLoader.java:361)

	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

	at java.security.AccessController.doPrivileged(Native Method)

	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)

	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:41)

	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:29)

	at java.lang.ClassLoader.loadClass(ClassLoader.java:423)

	at java.lang.ClassLoader.loadClass(ClassLoader.java:356)

	at cz.boosik.boosCooldown.boosCoolDown.<init>(boosCoolDown.java:24)

	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

	at java.lang.reflect.Constructor.newInstance(Constructor.java:525)

	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:144)

	... 8 more

Caused by: java.lang.ClassNotFoundException: org.bukkit.event.player.PlayerListener

	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)

	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

	at java.security.AccessController.doPrivileged(Native Method)

	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)

	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:41)

	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:29)

	at java.lang.ClassLoader.loadClass(ClassLoader.java:423)

	at java.lang.ClassLoader.loadClass(ClassLoader.java:356)

	... 27 more