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:131)
        at java.util.jar.JarFile.<init>(JarFile.java:150)
        at java.util.jar.JarFile.<init>(JarFile.java:114)
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:60)
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:213)
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:136)
        at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:143)
        at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:110)
        at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationManager.java:51)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:133)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:337)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)