Player can't be cast to OfflinePlayer

[Vladg24YT]

Log:

[WARNING] Unexpected exception while parsing console command
org.bukkit.command.CommandException: Unhandled exception executing 'deop Vladg24' in org.bukkit.command.defaults.DeopCommand@29bf050f
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:135)
	at ru.vladthemountain.lilybukkit.LilyBukkit.dispatchCommand(LilyBukkit.java:512)
	at net.minecraft.server.MinecraftServer.commandLineParser(MinecraftServer.java:301)
	at net.minecraft.server.MinecraftServer.doTick(MinecraftServer.java:283)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:217)
	at net.minecraft.src.ThreadServerApplication.run(ThreadServerApplication.java:14)
Caused by: java.lang.ClassCastException: class ru.vladthemountain.lilybukkit.entity.LBPlayer cannot be cast to class org.bukkit.OfflinePlayer (ru.vladthemountain.lilybukkit.entity.LBPlayer and org.bukkit.OfflinePlayer are in unnamed module of loader 'app')
	at ru.vladthemountain.lilybukkit.LilyBukkit.getOfflinePlayer(LilyBukkit.java:677)
	at org.bukkit.command.defaults.DeopCommand.execute(DeopCommand.java:28)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:131)
	... 5 more