14:04:01 [INFO] This server is running CraftBukkit version git-Bukkit-1.4.6-R0.3
-b2586jnks (MC: 1.4.6) (Implementing API version 1.4.6-R0.3)
14:04:01 [SEVERE] Could not load 'plugins\boosCooldowns_jre6_.jar' in folder 'pl
ugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError
: cz/boosik/boosCooldown/boosCoolDown : Unsupported major.minor version 51.0
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:184)
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.
java:305)
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager
.java:230)
        at org.bukkit.craftbukkit.v1_4_6.CraftServer.loadPlugins(CraftServer.jav
a:239)
        at org.bukkit.craftbukkit.v1_4_6.CraftServer.<init>(CraftServer.java:217
)
        at net.minecraft.server.v1_4_6.PlayerList.<init>(PlayerList.java:52)
        at net.minecraft.server.v1_4_6.DedicatedPlayerList.<init>(SourceFile:11)

        at net.minecraft.server.v1_4_6.DedicatedServer.init(DedicatedServer.java
:104)
        at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:
399)
        at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:84
9)
Caused by: java.lang.UnsupportedClassVersionError: cz/boosik/boosCooldown/boosCo
olDown : Unsupported major.minor version 51.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(Unknown Source)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$000(Unknown Source)
        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.findClass0(PluginClassLoader
.java:80)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:53)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:173)
        ... 9 more
14:04:01 [INFO] [GroupManager] Loading GroupManager v2.0 (Dev2.9.774) (Phoenix)
14:04:01 [INFO] [NoCheatPlus] Loading NoCheatPlus v3.8.8-b301
14:04:01 [INFO] [WorldEdit] Loading WorldEdit v5.5
14:04:01 [INFO] [Permissions] Loading Permissions v3.1.6
14:04:01 [INFO] [CombatTag] Loading CombatTag v5.5
14:04:01 [INFO] [WorldGuard] Loading WorldGuard v5.7
14:04:01 [INFO] [Essentials] Loading Essentials vDev2.9.774