Caused by: java.lang.UnsupportedOperationException: Use BukkitRunnable#runTaskLater(Plugin, long)
at org.bukkit.craftbukkit.v1_14_R1.scheduler.CraftScheduler.scheduleSyncDelayedTask(CraftScheduler.java:491) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at com.kohlerpop1.ArmorEffectsMaven.Events.ItemPickupEvent.ItemPickup(ItemPickupEvent.java:24) ~[?:?]
at sun.reflect.GeneratedMethodAccessor393.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_101]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_101]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:316) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
... 17 more

This should now be working properly!