Plugin Not Working

the command was working then all of a sudden it just stopped i think it happens when i add a new plugin to the Plugins folder anyways This is the error im getting

Code:

[21:43:18] [Server thread/ERROR]: Could not load 'plugins\Gamemode.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.IllegalArgumentException: Plugin already initialized!
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) ~[spigot-1.8.jar:git-Spigot-550ebac-7019900]
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[spigot-1.8.jar:git-Spigot-550ebac-7019900]
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [spigot-1.8.jar:git-Spigot-550ebac-7019900]
    at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugins(CraftServer.java:291) [spigot-1.8.jar:git-Spigot-550ebac-7019900]
    at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:152) [spigot-1.8.jar:git-Spigot-550ebac-7019900]
    at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:505) [spigot-1.8.jar:git-Spigot-550ebac-7019900]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_65]
Caused by: java.lang.IllegalArgumentException: Plugin already initialized!
    at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:122) ~[spigot-1.8.jar:git-Spigot-550ebac-7019900]
    at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:66) ~[spigot-1.8.jar:git-Spigot-550ebac-7019900]
    at me.deaven.main.<init>(main.java:10) ~[?:?]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_65]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_65]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_65]
    at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_65]
    at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_65]
    at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:76) ~[spigot-1.8.jar:git-Spigot-550ebac-7019900]
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[spigot-1.8.jar:git-Spigot-550ebac-7019900]
    ... 6 more
Caused by: java.lang.IllegalStateException: Initial initialization
    at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:125) ~[spigot-1.8.jar:git-Spigot-550ebac-7019900]
    at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:66) ~[spigot-1.8.jar:git-Spigot-550ebac-7019900]
    at me.deaven.main.<init>(main.java:10) ~[?:?]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_65]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_65]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_65]
    at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_65]
    at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_65]
    at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:76) ~[spigot-1.8.jar:git-Spigot-550ebac-7019900]
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[spigot-1.8.jar:git-Spigot-550ebac-7019900]
    ... 6 more

 

Your issue is on line 10 from what the stack trace error says. Mind pasting your 'main' class in a pastebin so myself or someone else could help?