Solved Server errors

I have a localhost server my plugin works good and al my others to and when i place them in an free test server they doesn't works he says: An internal error occurred while attempting to perform this command

console:

Code:

[09:49:00 INFO]: CookieGamerNL issued server command: /firstkill setlobby
[09:49:00 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'firstkill' in plugin FirstKill v1.0
  at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:703) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  at net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerConnection.java:953) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:815) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  at net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java:28) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  at net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat.java:47) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:157) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  at net.minecraft.server.v1_7_R3.ServerConnection.c(SourceFile:134) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:667) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:260) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:558) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:469) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
Caused by: java.lang.NoClassDefFoundError: net/md_5/bungee/api/ChatColor
  at me.coding.firstkill.Main.onCommand(Main.java:37) ~[?:?]
  at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  ... 13 more
Caused by: java.lang.ClassNotFoundException: net.md_5.bungee.api.ChatColor
  at java.net.URLClassLoader$1.run(URLClassLoader.java:366) ~[?:1.7.0_75]
  at java.net.URLClassLoader$1.run(URLClassLoader.java:355) ~[?:1.7.0_75]
  at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_75]
  at java.net.URLClassLoader.findClass(URLClassLoader.java:354) ~[?:1.7.0_75]
  at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:77) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_75]
  at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_75]
  at me.coding.firstkill.Main.onCommand(Main.java:37) ~[?:?]
  at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
  ... 13 more

 

@NoSpanMan You're using Spigot for your library, and using net.md_5.bungee.api.ChatColor instead of org.bukkit.ChatColor.

 

I can't find craftbukkit 1.7

 

@NoSpanMan You are using it on your server... Like the jar you run your server with is that. But you don't need it unless you're using NMS/Packets, you can just use the API (Bukkit)

 

@nverdier But i code my plugin with spigot i think so but i change it and he gives the same error how can i fix this?

@nverdier How can i set it to org.bukkit.ChatColor. i use ChatColor.AQUA <--- ect.

 

@NoSpanMan Change the import.

 

@nverdier I do that but it doesn't works

 

@NoSpanMan What do you do? Please post the code after the change. And the error if there is one.

 

@nverdier I see something i gonna try something

 

@NoSpanMan Ok then.

 

Moved to Bukkit Alternates.

 

It works @nverdier thanks!

 

@NoSpanMan Glad I could help! Please mark your thread as solved. See this for more info.