Bukkit

What steps will reproduce the problem?
1. Starting server
2.
3.

What is the expected output? What do you see instead?
I expect it to load, instead it comes up with errors.

What version of API+, SpoutPlugin and CraftBukkit are you using?
API: 2.2
Spoutplugin: latest
CB: latest

Do you have an error log of what happened?
Yes, here it is

11:24:26 [SEVERE] Could not load 'plugins/ApiPlus.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: team/ApiPlus/ApiPlus : Unsupported major.minor version 51.0
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java: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_R1.CraftServer.loadPlugins(CraftServer.java:239)
    at org.bukkit.craftbukkit.v1_4_R1.CraftServer.<init>(CraftServer.java:217)
    at net.minecraft.server.v1_4_R1.PlayerList.<init>(PlayerList.java:55)
    at net.minecraft.server.v1_4_R1.DedicatedPlayerList.<init>(SourceFile:11)
    at net.minecraft.server.v1_4_R1.DedicatedServer.init(DedicatedServer.java:104)
    at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:399)
    at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.UnsupportedClassVersionError: team/ApiPlus/ApiPlus : Unsupported major.minor version 51.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    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(ClassLoader.java:306)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:247)
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:173)
    ... 9 more

Please provide any additional information below.
I would like this to get solved today

same here

same im screwed with this too

I believe that means that the Java version used to compile Api+ is newer than the version you're trying to use, try updating your Java to the newest version.

Also try the new version 2.4 which should fix many bugs.