16:07:01 [SEVERE] Could not load 'plugins\ultimatefightercore.jar' in folder 'pl
ugins'
org.bukkit.plugin.InvalidDescriptionException: name 'ultimatefightercore;' conta
ins invalid characters.
        at org.bukkit.plugin.PluginDescriptionFile.loadMap(PluginDescriptionFile
.java:191)
        at org.bukkit.plugin.PluginDescriptionFile.<init>(PluginDescriptionFile.
java:42)
        at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPlug
inLoader.java:202)
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager
.java:132)
        at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:223)
        at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:199)
        at net.minecraft.server.ServerConfigurationManagerAbstract.<init>(Server
ConfigurationManagerAbstract.java:50)
        at net.minecraft.server.ServerConfigurationManager.<init>(SourceFile:11)

        at net.minecraft.server.DedicatedServer.init(DedicatedServer.java:105)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:377)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)