Solved Multiple class error?!

Hi, today I tried for the first time to make a multiple class plugin but it failed.
I followed a tuto but noting does it, it gives me erros on startup.

Code:

java.lang.IllegalArgumentException: Plugin already initialized!
    at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:122) ~[spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:66) ~[spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at com.commands.maxx.MySQL.<init>(MySQL.java:23) ~[?:?]
    at com.commands.maxx.Main.onEnable(Main.java:63) ~[?:?]
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:335) [spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugin(CraftServer.java:355) [spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at org.bukkit.craftbukkit.v1_8_R1.CraftServer.enablePlugins(CraftServer.java:315) [spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at net.minecraft.server.v1_8_R1.MinecraftServer.q(MinecraftServer.java:402) [spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at net.minecraft.server.v1_8_R1.MinecraftServer.k(MinecraftServer.java:370) [spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at net.minecraft.server.v1_8_R1.MinecraftServer.a(MinecraftServer.java:325) [spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:211) [spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:494) [spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at java.lang.Thread.run(Unknown Source) [?:1.7.0_75]
Caused by: java.lang.IllegalStateException: Initial initialization
    at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:125) ~[spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:66) ~[spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at com.commands.maxx.Main.<init>(Main.java:38) ~[?:?]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.7.0_75]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.7.0_75]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.7.0_75]
    at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.7.0_75]
    at java.lang.Class.newInstance(Unknown Source) ~[?:1.7.0_75]
    at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:76) ~[spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) ~[spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugins(CraftServer.java:290) ~[spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:152) ~[spigot-1.8.jar:git-Spigot-c46583f-0643caa]
    ... 2 more

Thank you

 

Don't make multiple (in this case, any new) instances of your main class.

 

@1Rogue what does this mean? (I'm not that good in english)

 

@Maxx_Qc, @1Rogue is right, either pass the main class instance via constructors or use java simpleton

 

@mine-care If I give you my code, could you help me?

 

http://pastebin.com/SXNuLM83
http://pastebin.com/FekzQDuG

 

@timtower Got it, thank you.
But how can I getConfig() from the second class?
private String user = getConfig().getString("username");
Main.getConfig() doesn't work!

 

I got off every Static except private static Plugin plugin;
mainPlugin.getConfig() doesn't work and Main.getConfig() reports an error : Cannot make a static reference to the non-static methog getConfig() from the type JavaPlugin
@timtower

 

@timtower Ok fine, could you send me the constructor for getConfig then?

 

@timtower I will just read a tutorial then!
Solved!

 

@1Rogue Loool XD