Bukkit

What steps will reproduce the problem?
1. idk
2. idk
3. idk

What is the expected output? What do you see instead?

im expecting it to run perfectly fine but it doesn't run at all

What version of the product are you using?
v 1.9.4

Are you using a Spigot 1.8 patch build?
no

Do you have an error log of what happened?
Yes:
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: me/artish1/OITC/OITC : 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: me/artish1/OITC/OITC : 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
[14:52:22 ERROR]: Could not load 'plugins/SurvivalGames.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: me/maker56/survivalgames/SurvivalGames : 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: me/maker56/survivalgames/SurvivalGames : 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

What other plugin(s) do you have on the server?
Essentials
Vault
Group Manager
Warp Portals

Please provide any additional information below.
/sg is an unknown command
+ when i type /plugins
Survival games does not come up
This is a spigot 1.7.10 server i believe

I see that you don't have WorldEdit. Install WorldEdit. It should work fine. :)

Update your Java to 7 or 8