BattleKits Dev build error

10.11 06:58:19 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:143)
10.11 06:58:19 [Server] INFO at java.lang.Class.forName(Class.java:264)
10.11 06:58:19 [Server] INFO at java.lang.Class.forName0(Native Method)
10.11 06:58:19 [Server] INFO at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
10.11 06:58:19 [Server] INFO at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
10.11 06:58:19 [Server] INFO at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:29)
10.11 06:58:19 [Server] INFO at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:44)
10.11 06:58:19 [Server] INFO at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
10.11 06:58:19 [Server] INFO at java.security.AccessController.doPrivileged(Native Method)
10.11 06:58:19 [Server] INFO at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
10.11 06:58:19 [Server] INFO at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
10.11 06:58:19 [Server] INFO Caused by: java.lang.ClassNotFoundException: com.lavacraftserver.BattleKits.BattleKits
10.11 06:58:19 [Server] INFO at net.minecraft.server.ThreadServerApplication.run(SourceFile:818)
10.11 06:58:19 [Server] INFO at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:419)
10.11 06:58:19 [Server] INFO at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:486)
10.11 06:58:19 [Server] INFO at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:215)
10.11 06:58:19 [Server] INFO at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:569)
10.11 06:58:19 [Server] INFO at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
10.11 06:58:19 [Server] INFO at net.minecraft.server.ServerConnection.b(SourceFile:35)
10.11 06:58:19 [Server] INFO at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:111)
10.11 06:58:19 [Server] INFO at net.minecraft.server.NetworkManager.b(NetworkManager.java:282)
10.11 06:58:19 [Server] INFO at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:44)
10.11 06:58:19 [Server] INFO at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:806)
10.11 06:58:19 [Server] INFO at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:824)
10.11 06:58:19 [Server] INFO at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:911)
10.11 06:58:19 [Server] INFO at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:504)
10.11 06:58:19 [Server] INFO at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:185)
10.11 06:58:19 [Server] INFO at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:22)
10.11 06:58:19 [Server] INFO at org.bukkit.Bukkit.reload(Bukkit.java:183)
10.11 06:58:19 [Server] INFO at org.bukkit.craftbukkit.CraftServer.reload(CraftServer.java:579)
10.11 06:58:19 [Server] INFO at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:229)
10.11 06:58:19 [Server] INFO at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:230)
10.11 06:58:19 [Server] INFO at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:305)
10.11 06:58:19 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:154)
10.11 06:58:19 [Server] INFO org.bukkit.plugin.InvalidPluginException: java.lang.ClassNotFoundException: com.lavacraftserver.BattleKits.BattleKits
10.11 06:58:19 [Server] SEVERE Could not load 'plugins/BattleKits.jar' in folder 'plugins'