Bukkit

What steps will reproduce the problem?
1. I happens just when I start my server, I assume something with it and factions

What is the expected output? What do you see instead?
Wat.

What version of FactionAlert are you using?
v0.53

Do you have an error log of what happened?

[22:02:10] [Server thread/ERROR]: Could not load 'plugins/factionalert-0.53.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: com/massivecraft/mcore/cmd/MCommand
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[spigot-1543.jar:git-Spigot-1543]
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[spigot-1543.jar:git-Spigot-1543]
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [spigot-1543.jar:git-Spigot-1543]
    at org.bukkit.craftbukkit.v1_7_R3.CraftServer.loadPlugins(CraftServer.java:369) [spigot-1543.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.DedicatedServer.init(DedicatedServer.java:136) [spigot-1543.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:458) [spigot-1543.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [spigot-1543.jar:git-Spigot-1543]
Caused by: java.lang.NoClassDefFoundError: com/massivecraft/mcore/cmd/MCommand
    at java.lang.Class.forName0(Native Method) ~[?:1.7.0_60]
    at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_60]
    at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:40) ~[spigot-1543.jar:git-Spigot-1543]
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot-1543.jar:git-Spigot-1543]
    ... 6 more
Caused by: java.lang.ClassNotFoundException: com.massivecraft.mcore.cmd.MCommand
    at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_60]
    at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_60]
    at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_60]
    at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.7.0_60]
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:77) ~[spigot-1543.jar:git-Spigot-1543]
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[spigot-1543.jar:git-Spigot-1543]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_60]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_60]
    at java.lang.Class.forName0(Native Method) ~[?:1.7.0_60]
    at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_60]
    at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:40) ~[spigot-1543.jar:git-Spigot-1543]
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot-1543.jar:git-Spigot-1543]
    ... 6 more

Please provide any additional information below.
I'm running the best version of factions.  Factions 1.8.2