15:21:21 [SEVERE] Could not load 'plugins/No_Grief Ip Logger.jar' in folder 'plugins':
java.lang.UnsupportedClassVersionError: me/sayaad/NG_IP_Logger/main : 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.findClass(PluginClassLoader.java:36)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:24)
	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:170)
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:215)
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:136)
	at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:151)
	at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:127)
	at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationManager.java:52)
	at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:145)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:399)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)
15:21:21 [SEVERE] Could not load 'plugins/No_Grief Main.jar' in folder 'plugins':
java.lang.UnsupportedClassVersionError: me/sayaad/No_Grief/main : 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.findClass(PluginClassLoader.java:36)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:24)
	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:170)
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:215)
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:136)
	at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:151)
	at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:127)
	at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationManager.java:52)
	at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:145)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:399)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)