19.01 20:58:13 [Server] WARN Exception in thread "Craft Scheduler Thread - 1"
19.01 20:58:13 [Server] WARN org.apache.commons.lang.UnhandledException: Plugin SlowSpawners v1.0-SNAPSHOT generated an exception while executing task 499
19.01 20:58:13 [Server] INFO at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
19.01 20:58:13 [Server] INFO at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
19.01 20:58:13 [Server] INFO at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
19.01 20:58:13 [Server] INFO at java.lang.Thread.run(Thread.java:748)
19.01 20:58:13 [Server] INFO Caused by: net.minecraft.server.v1_8_R3.CancelledPacketHandleException