Console Error

21:01:56 [SEVERE] Could not pass event PluginEnableEvent to Essentials
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:341)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:462)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader
.java:381)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManage
r.java:381)
        at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:266)
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:248
)
        at net.minecraft.server.MinecraftServer.i(MinecraftServer.java:297)
        at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:276)
        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:226)
        at net.minecraft.server.DedicatedServer.init(DedicatedServer.java:140)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:377)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Caused by: ru.tehkode.permissions.exceptions.PermissionsNotAvailable: Permission
s manager is not accessable. Is the PermissionsEx plugin enabled?
        at ru.tehkode.permissions.bukkit.PermissionsEx.getPermissionManager(Perm
issionsEx.java:152)
        at com.earth2me.essentials.perm.PermissionsExHandler.<init>(PermissionsE
xHandler.java:17)
        at com.earth2me.essentials.perm.PermissionsHandler.checkPermissions(Perm
issionsHandler.java:110)
        at com.earth2me.essentials.EssentialsPluginListener.onPluginEnable(Essen
tialsPluginListener.java:23)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:339)
        ... 13 more