08:00:20 [SEVERE] Could not load 'plugins/AntiJoinBot.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_5_R2.CraftServer.loadPlugins(CraftServer.java:239)
    at org.bukkit.craftbukkit.v1_5_R2.CraftServer.<init>(CraftServer.java:217)
    at net.minecraft.server.v1_5_R2.PlayerList.<init>(PlayerList.java:55)
    at net.minecraft.server.v1_5_R2.DedicatedPlayerList.<init>(SourceFile:11)
    at net.minecraft.server.v1_5_R2.DedicatedServer.init(DedicatedServer.java:105)
    at net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java:381)
    at net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:573)
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)
    ... 8 more