Bukkit

What steps will reproduce the problem?
1. Use Cauldron for MC 1.7.10
2. Use OTP 1.6

What is the expected output? What do you see instead?
Plugin should load at server start. Instead it throws an error.

What version of the product are you using?
OTP 1.6

Do you have an error log of what happened?

[13:18:09] [Server thread/INFO]: [OfflineTp] Enabling OfflineTp v1.6
[13:18:09] [Server thread/ERROR]: Error occurred while enabling OfflineTp v1.6 (Is it up to date?)
java.lang.IllegalArgumentException: Plugin already initialized!
    at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:503) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.10-1.1381.06.221]
    at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:66) ~[JavaPlugin.class:git-Cauldron-MCPC-Plus-1.7.10-1.1381.06.221]
    at me.fredoduquartier_offlinetp.Main.<init>(Main.java:38) ~[?:?]
    at me.fredoduquartier_offlinetp.comhandl.Atp.<init>(Atp.java:14) ~[?:?]
    at me.fredoduquartier_offlinetp.Main.registerCommands(Main.java:292) ~[?:?]
    at me.fredoduquartier_offlinetp.Main.onEnable(Main.java:63) ~[?:?]
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:316) ~[JavaPlugin.class:git-Cauldron-MCPC-Plus-1.7.10-1.1381.06.221]
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:368) [JavaPluginLoader.class:git-Cauldron-MCPC-Plus-1.7.10-1.1381.06.221]
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:410) [SimplePluginManager.class:git-Cauldron-MCPC-Plus-1.7.10-1.1381.06.221]
    at org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugin(CraftServer.java:415) [CraftServer.class:git-Cauldron-MCPC-Plus-1.7.10-1.1381.06.221]
    at org.bukkit.craftbukkit.v1_7_R4.CraftServer.enablePlugins(CraftServer.java:349) [CraftServer.class:git-Cauldron-MCPC-Plus-1.7.10-1.1381.06.221]
    at net.minecraft.server.MinecraftServer.func_71243_i(MinecraftServer.java:500) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:474) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:434) [MinecraftServer.class:?]
    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:329) [lt.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:620) [MinecraftServer.class:?]
    at java.lang.Thread.run(Thread.java:745) [?:1.7.0_80]
Caused by: java.lang.IllegalStateException: Initial initialization
    at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:506) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.10-1.1381.06.221]
    at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:66) ~[JavaPlugin.class:git-Cauldron-MCPC-Plus-1.7.10-1.1381.06.221]
    at me.fredoduquartier_offlinetp.Main.<init>(Main.java:38) ~[?:?]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.7.0_80]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) ~[?:1.7.0_80]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.7.0_80]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526) ~[?:1.7.0_80]
    at java.lang.Class.newInstance(Class.java:383) ~[?:1.7.0_80]
    at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:201) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.10-1.1381.06.221]
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:145) ~[JavaPluginLoader.class:git-Cauldron-MCPC-Plus-1.7.10-1.1381.06.221]
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:334) ~[SimplePluginManager.class:git-Cauldron-MCPC-Plus-1.7.10-1.1381.06.221]
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:256) ~[SimplePluginManager.class:git-Cauldron-MCPC-Plus-1.7.10-1.1381.06.221]
    at org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugins(CraftServer.java:320) ~[CraftServer.class:git-Cauldron-MCPC-Plus-1.7.10-1.1381.06.221]
    at net.minecraft.world.storage.SaveHandler.initBukkitData(SaveHandler.java:459) ~[ayq.class:?]
    at net.minecraft.world.storage.SaveHandler.func_75757_d(SaveHandler.java:137) ~[ayq.class:?]
    at net.minecraft.world.World.<init>(World.java:350) ~[ahb.class:?]
    at net.minecraft.world.WorldServer.<init>(WorldServer.java:153) ~[mt.class:?]
    at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:356) ~[MinecraftServer.class:?]
    ... 3 more

Please provide any additional information below.
Strangely enough you can still use the /otp commands in game. They don't throw any errors but they don't seem to work however.
[13:22:10] [Server thread/INFO]: InsaneJ issued server command: /otp Metamorfos spawn
[13:22:20] [Server thread/INFO]: InsaneJ issued server command: /otp all here
[13:22:23] [Server thread/INFO]: InsaneJ issued server command: /otp all spawn