DG Error

2012-12-23 23:31:41 [SEVERE] Could not load 'plugins\Demigods.jar' in folder 'plugins'
org.bukkit.plugin.InvalidDescriptionException: Invalid plugin.yml
	at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:255)
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:132)
	at org.bukkit.craftbukkit.v1_4_6.CraftServer.loadPlugins(CraftServer.java:235)
	at org.bukkit.craftbukkit.v1_4_6.CraftServer.<init>(CraftServer.java:213)
	at net.minecraft.server.v1_4_6.PlayerList.<init>(PlayerList.java:52)
	at net.minecraft.server.v1_4_6.DedicatedPlayerList.<init>(SourceFile:11)
	at net.minecraft.server.v1_4_6.DedicatedServer.init(DedicatedServer.java:104)
	at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:399)
	at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.util.zip.ZipException: error in opening zip file
	at java.util.zip.ZipFile.open(Native Method)
	at java.util.zip.ZipFile.<init>(Unknown Source)
	at java.util.zip.ZipFile.<init>(Unknown Source)
	at java.util.jar.JarFile.<init>(Unknown Source)
	at java.util.jar.JarFile.<init>(Unknown Source)
	at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:243)
	... 8 more