Помогите DrafonTimer плагин

Добрый вечер! Сегодня скачал плагин DragonTimer на ивенты эндердракона,а он не спавнится и в консоль спамит

[22:55:00] [Server thread/WARN]: [DragonTimer] Task #920035 for DragonTimer v1.5.10 generated an exception

java.lang.NullPointerException: null

at de.jeppa.DragonTimer.DragonTimer.lambda$0(DragonTimer.java:337) ~[?:?]

at org.bukkit.craftbukkit.v1_16_R3.scheduler.CraftTask.run(CraftTask.java:81) ~[Paper.jar:3096a-Spigot-9fb885e-af1a232]

at org.bukkit.craftbukkit.v1_16_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:400) ~[Paper.jar:3096a-Spigot-9fb885e-af1a232]

at net.minecraft.server.v1_16_R3.MinecraftServer.b(MinecraftServer.java:1179) ~[Paper.jar:3096a-Spigot-9fb885e-af1a232]

at net.minecraft.server.v1_16_R3.DedicatedServer.b(DedicatedServer.java:394) ~[Paper.jar:3096a-Spigot-9fb885e-af1a232]

at net.minecraft.server.v1_16_R3.MinecraftServer.a(MinecraftServer.java:1127) ~[Paper.jar:3096a-Spigot-9fb885e-af1a232]

at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:966) ~[Paper.jar:3096a-Spigot-9fb885e-af1a232]

at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$0(MinecraftServer.java:273) ~[Paper.jar:3096a-Spigot-9fb885e-af1a232]

at java.lang.Thread.run(Thread.java:829) [?:?]

 

почему нн?