mcjobs yml problem

2012-06-29 22:22:21 [SEVERE] Could not load 'plugins\mcjobs.jar' in folder 'plugins'
org.bukkit.plugin.InvalidDescriptionException: Invalid plugin.yml
    at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:202)
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:132)
    at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:213)
    at org.bukkit.craftbukkit.CraftServer.reload(CraftServer.java:550)
    at org.bukkit.Bukkit.reload(Bukkit.java:182)
    at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:22)
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:166)
    at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:479)
    at org.bukkit.craftbukkit.CraftServer.dispatchServerCommand(CraftServer.java:475)
    at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:612)
    at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:581)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
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.jar.JarFile.<init>(Unknown Source)
    at java.util.jar.JarFile.<init>(Unknown Source)
    at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:190)
    ... 12 more