I am currently running the latest EssentialsX build and running 1.8 Spigot on my server.
Whenever a player joins the server, my console gives me this error:
28.02 23:56:53 [Server] WARN Exception in thread "Craft Scheduler Thread - 3" 28.02 23:56:53 [Server] WARN org.apache.commons.lang.UnhandledException: Plugin Essentials v2.0.1-b370 generated an exception while executing task 590 28.02 23:56:53 [Server] INFO at org.bukkit.craftbukkit.v1_8_R2.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56) 28.02 23:56:53 [Server] INFO at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 28.02 23:56:53 [Server] INFO at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 28.02 23:56:53 [Server] INFO at java.lang.Thread.run(Thread.java:745) 28.02 23:56:53 [Server] INFO Caused by: java.lang.NoSuchMethodError: com.earth2me.essentials.ISettings.getSpawnOnJoinGroups()Ljava/util/List; 28.02 23:56:53 [Server] INFO at com.earth2me.essentials.spawn.EssentialsSpawnPlayerListener.delayedJoin(EssentialsSpawnPlayerListener.java:75) 28.02 23:56:53 [Server] INFO at com.earth2me.essentials.spawn.EssentialsSpawnPlayerListener$1.run(EssentialsSpawnPlayerListener.java:67) 28.02 23:56:53 [Server] INFO at org.bukkit.craftbukkit.v1_8_R2.scheduler.CraftTask.run(CraftTask.java:71) 28.02 23:56:53 [Server] INFO at org.bukkit.craftbukkit.v1_8_R2.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53) 28.02 23:56:53 [Server] INFO ... 3 more

Now this doesn't cause any issues in the actual server, but it's really annoying to see so I'm looking for a fix :)

Thanks!