Development Assistance Plugin dont load on spigot server

Hi guys, im creating a simple join plugin using TitleAPI,TabAPI,Converters and Reflection class for my server, when i load my plugin to ftp and reload server he gives me a console error

Code:

at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at java.lang.Class.forName(Class.java:274) ~[?:1.6.0_33]
at java.lang.Class.forName0(Native Method) ~[?:1.6.0_33]
at java.lang.ClassLoader.loadClass(ClassLoader.java:268) ~[?:1.6.0_33]
at java.lang.ClassLoader.loadClass(ClassLoader.java:323) ~[?:1.6.0_33]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at java.net.URLClassLoader.findClass(URLClassLoader.java:205) ~[?:1.6.0_33]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.6.0_33]
at java.net.URLClassLoader$1.run(URLClassLoader.java:212) ~[?:1.6.0_33]
at java.net.URLClassLoader.access$000(URLClassLoader.java:73) ~[?:1.6.0_33]
at java.net.URLClassLoader.defineClass(URLClassLoader.java:277) ~[?:1.6.0_33]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.6.0_33]
at java.lang.ClassLoader.defineClass(ClassLoader.java:643) ~[?:1.6.0_33]
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.6.0_33]
Caused by: java.lang.UnsupportedClassVersionError: t/wax/a/Main : Unsupported major.minor version 52.0
at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:734) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:186) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at net.minecraft.server.v1_7_R4.PacketPlayInChat.handle(PacketPlayInChat.java:65) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at net.minecraft.server.v1_7_R4.PacketPlayInChat.a(PacketPlayInChat.java:28) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:880) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at net.minecraft.server.v1_7_R4.PlayerConnection.handleCommand(PlayerConnection.java:1043) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at org.bukkit.craftbukkit.v1_7_R4.CraftServer.dispatchCommand(CraftServer.java:767) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:181) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:23) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at org.bukkit.Bukkit.reload(Bukkit.java:301) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at org.bukkit.craftbukkit.v1_7_R4.CraftServer.reload(CraftServer.java:864) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugins(CraftServer.java:369) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:258) [spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:336) ~[spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[spigot2.jar:git-Spigot-1.7.9-R0.2-205-g3633afe]
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: t/wax/a/Main : Unsupported major.minor version 52.0
[21:41:10] [Server thread/ERROR]: Could not load 'plugins/Fluzzer.jar' in folder 'plugins'

Can anyone help me? Thanks