Can anybody help me my server keeps saying this whenever i try and use the plugin
Could not load 'plugins/Korra.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: com/projectkorra/ProjectKorra/ProjectKorra : Unsupported major.minor version 51.0
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) ~[Spigot.jar:git-Spigot-8a983f9-e81edfc]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[Spigot.jar:git-Spigot-8a983f9-e81edfc]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [Spigot.jar:git-Spigot-8a983f9-e81edfc]
at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugins(CraftServer.java:291) [Spigot.jar:git-Spigot-8a983f9-e81edfc]
at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:152) [Spigot.jar:git-Spigot-8a983f9-e81edfc]
at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:505) [Spigot.jar:git-Spigot-8a983f9-e81edfc]
at java.lang.Thread.run(Thread.java:695) [?:1.6.0_65]
Caused by: java.lang.UnsupportedClassVersionError: com/projectkorra/ProjectKorra/ProjectKorra : 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:101) ~[Spigot.jar:git-Spigot-8a983f9-e81edfc]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[Spigot.jar:git-Spigot-8a983f9-e81edfc]
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:64) ~[Spigot.jar:git-Spigot-8a983f9-e81edfc]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[Spigot.jar:git-Spigot-8a983f9-e81edfc]