2013-08-20 13:07:29 [SEVERE] Could not load 'plugins/StackableItems.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_6_R2.CraftServer.loadPlugins(CraftServer.java:243)
>       at net.minecraft.server.v1_6_R2.DedicatedServer.init(DedicatedServer.java:117)
>       at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:397)
>       at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
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>(ZipFile.java:214)
>       at java.util.zip.ZipFile.<init>(ZipFile.java:144)
>       at java.util.jar.JarFile.<init>(JarFile.java:153)
>       at java.util.jar.JarFile.<init>(JarFile.java:117)
>       at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:243)
>       ... 5 more