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java.lang.NullPointerException: 	at net.milkbowl.vault.permission.plugins.Permission_GroupManager.getPrimaryGroup(Permission_GroupManager.java:327)	at net.milkbowl.vault.permission.Permission.getPrimaryGroup(Permission.java:726)	at net.milkbowl.vault.permission.Permission.getPrimaryGroup(Permission.java:738)	at com.earth2me.essentials.perm.impl.AbstractVaultHandler.getGroup(AbstractVaultHandler.java:33)	at com.earth2me.essentials.perm.PermissionsHandler.getGroup(PermissionsHandler.java:28)	at com.earth2me.essentials.User.getGroup(User.java:622)	at com.earth2me.essentials.textreader.TextInput.(TextInput.java:28)	at com.earth2me.essentials.EssentialsPlayerListener.delayedJoin(EssentialsPlayerListener.java:209)	at com.earth2me.essentials.EssentialsPlayerListener$1.run(EssentialsPlayerListener.java:179)	at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftTask.run(CraftTask.java:53)	at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:52)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)