[17:27:25 ERROR]: Could not load 'plugins/MRL.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: com/koletar/jj/mineresetlite/MineResetLite : Unsupported major.minor version 51.0
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[bukkit.jar:git-Spigot-1360]
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[bukkit.jar:git-Spigot-1360]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [bukkit.jar:git-Spigot-1360]
	at org.bukkit.craftbukkit.v1_7_R2.CraftServer.loadPlugins(CraftServer.java:356) [bukkit.jar:git-Spigot-1360]
	at net.minecraft.server.v1_7_R2.DedicatedServer.init(DedicatedServer.java:135) [bukkit.jar:git-Spigot-1360]
	at net.minecraft.server.v1_7_R2.MinecraftServer.run(MinecraftServer.java:440) [bukkit.jar:git-Spigot-1360]
	at net.minecraft.server.v1_7_R2.ThreadServerApplication.run(SourceFile:618) [bukkit.jar:git-Spigot-1360]
Caused by: java.lang.UnsupportedClassVersionError: com/koletar/jj/mineresetlite/MineResetLite : Unsupported major.minor version 51.0
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.6.0_65]
	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637) ~[?:1.6.0_65]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:621) ~[?:1.6.0_65]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) ~[?:1.6.0_65]
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) ~[?:1.6.0_65]
	at java.net.URLClassLoader.access$000(URLClassLoader.java:58) ~[?:1.6.0_65]
	at java.net.URLClassLoader$1.run(URLClassLoader.java:197) ~[?:1.6.0_65]
	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.6.0_65]
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190) ~[?:1.6.0_65]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:77) ~[bukkit.jar:git-Spigot-1360]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[bukkit.jar:git-Spigot-1360]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306) ~[?:1.6.0_65]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:247) ~[?:1.6.0_65]
	at java.lang.Class.forName0(Native Method) ~[?:1.6.0_65]
	at java.lang.Class.forName(Class.java:249) ~[?:1.6.0_65]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:40) ~[bukkit.jar:git-Spigot-1360]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:127) ~[bukkit.jar:git-Spigot-1360]
	... 6 more