Solved Could not load plugin "..." For every of my plugins

Hi,
All is in the title, when i launch my server, every of my plugins (vault, essentials,...) got

"[GRAVE] Could not load 'plugins\Essentials.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError
: Bad version number in .class file
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:150)
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.
java:305)
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager
.java:230)
at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:207)
at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:183)
at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigur
ationManager.java:53)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:156)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:422)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.UnsupportedClassVersionError: Bad version number in .class
file
at java.lang.ClassLoader.defineClass1(Native Method)
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$100(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.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)
at java.lang.ClassLoader.loadClassInternal(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:139)
... 8 more" or something like for others plugins.
Thank you for future help. PoPKoRn

up

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

You need to give more information, which is why you are not getting a response.
http://forums.bukkit.org/threads/you-need-help-we-need-this-information-to-help-you.2018/

It also may help to look through here:
http://forums.bukkit.org/threads/troubleshooting-common-problems-with-solution.44590/

 

Its Ok i solved the problem, i've got java instaled in x86 program files and in programfiles, but i dont know why, when in the run i specifi the x86 file it dont run good. So i just swap to have on my normal (x64) file.
Your first link help me for have this idea, Thank you.