Sgtitles Error

15:35:53 [INFO] [SGTitles] Enabling SGTitles v1.0
15:35:54 [INFO] [SGTitles] McMMO detected. Loading support...
15:35:54 [SEVERE] Error occurred while enabling SGTitles v1.0 (Is it up to date?
)
java.lang.NoClassDefFoundError: com/herocraftonline/dev/heroes/Heroes
        at com.sgcraft.sgtitles.SGTitles.checkHeroes(SGTitles.java:91)
        at com.sgcraft.sgtitles.SGTitles.onEnable(SGTitles.java:138)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:215)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader
.java:336)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManage
r.java:381)
        at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:250)
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:232
)
        at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:374)
        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:361)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:187)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:425)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:490)
Caused by: java.lang.ClassNotFoundException: com.herocraftonline.dev.heroes.Hero
es
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:41)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:29)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 12 more