[12:36:02 ERROR]: Could not load 'plugins/uCars.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: com/useful/ucars/ucars : Unsupported major.minor version 51.0
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[craftbukkit.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:336) ~[craftbukkit.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:258) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugins(CraftServer.java:369) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.DedicatedServer.init(DedicatedServer.java:152) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:458) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
Caused by: java.lang.UnsupportedClassVersionError: com/useful/ucars/ucars : 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) ~[craftbukkit.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[craftbukkit.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	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) ~[craftbukkit.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[craftbukkit.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	... 6 more