Development Assistance LinkageError problem

Hey!
I recieve this stacktrace only after I reload the plugin with PluginManager and go on a beacon (elevator...).

Stacktrace:

Stacktrace (open) Stacktrace (close)

Code:

[00:43:39] [Server thread/ERROR]: Could not pass event PlayerMoveEvent to PluginPackWladHD v1.3
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
    at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:249) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
    at net.minecraft.server.v1_7_R4.PacketPlayInFlying.a(SourceFile:137) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
    at net.minecraft.server.v1_7_R4.PacketPlayInPosition.handle(PacketPlayInPosition.java:35) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
    at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:186) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
    at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
    at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:734) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
    at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
    at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
    at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
    at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
Caused by: java.lang.LinkageError: loader constraint violation: when resolving method "de.wladhd.customevents.PlayerEnterElevatorEvent.<init>(Lorg/bukkit/entity/Player;Lde/wladhd/elevator/Elevator;Lde/wladhd/elevator/ElevatorManager$ElevatorDirection;)V" the class loader (instance of org/bukkit/plugin/java/PluginClassLoader) of the current class, de/wladhd/elevator/ElevatorManager, and the class loader (instance of org/bukkit/plugin/java/PluginClassLoader) for the method's defining class, de/wladhd/customevents/PlayerEnterElevatorEvent, have different Class objects for the type de/wladhd/elevator/Elevator used in the signature
    at de.wladhd.elevator.ElevatorManager.addPassenger(ElevatorManager.java:146) ~[?:?]
    at de.wladhd.listener.PlayerMove.OnMove(PlayerMove.java:139) ~[?:?]
    at sun.reflect.GeneratedMethodAccessor576.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0]
    at java.lang.reflect.Method.invoke(Method.java:483) ~[?:1.8.0]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
    ... 13 more

ElevatorManager.java:146 is:
PlayerEnterElevatorEvent ev = new PlayerEnterElevatorEvent(p, el, ed);

Where is the error?! If you need more code tell me...

 

Could you post your full code please?

 

@WladHD indeed, seeing your code would be great,