[17:31:40 WARN]: java.lang.ClassCastException: class de.marcely.bedwars.hologram.PacketHologram cannot be cast to class de.marcely.bedwars.hologram.controller.ArenasGUIOpenerController (de.marcely.bedwars.hologram.PacketHologram and de.marcely.bedwars.hologram.controller.ArenasGUIOpenerController are in unnamed module of loader org.bukkit.plugin.java.PluginClassLoader @cf0230)