Essentials Error

11.07 19:59:01 [Server] INFO at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:246)
11.07 19:59:01 [Server] INFO at org.bukkit.craftbukkit.help.SimpleHelpMap.initializeCommands(SimpleHelpMap.java:163)
11.07 19:59:01 [Server] INFO at org.bukkit.help.HelpTopic.amendTopic(HelpTopic.java:81)
11.07 19:59:01 [Server] INFO at org.bukkit.help.HelpTopic.applyAmendment(HelpTopic.java:99)
11.07 19:59:01 [Server] INFO at java.lang.String.replaceAll(String.java:2210)
11.07 19:59:01 [Server] INFO at java.util.regex.Matcher.replaceAll(Matcher.java:905)
11.07 19:59:01 [Server] INFO at java.util.regex.Matcher.appendReplacement(Matcher.java:757)
11.07 19:59:01 [Server] INFO java.lang.NullPointerException
11.07 19:59:01 [Server] SEVERE Unexpected exception
11.07 19:59:01 [Server] SEVERE at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
11.07 19:59:01 [Server] SEVERE at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:432)
11.07 19:59:01 [Server] SEVERE at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:197)
11.07 19:59:01 [Server] SEVERE at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:368)
11.07 19:59:01 [Server] SEVERE at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:381)
11.07 19:59:01 [Server] SEVERE at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:246)
11.07 19:59:01 [Server] SEVERE at org.bukkit.craftbukkit.help.SimpleHelpMap.initializeCommands(SimpleHelpMap.java:163)
11.07 19:59:01 [Server] SEVERE at org.bukkit.help.HelpTopic.amendTopic(HelpTopic.java:81)
11.07 19:59:01 [Server] SEVERE at org.bukkit.help.HelpTopic.applyAmendment(HelpTopic.java:99)
11.07 19:59:01 [Server] SEVERE at java.lang.String.replaceAll(String.java:2210)
11.07 19:59:01 [Server] SEVERE at java.util.regex.Matcher.replaceAll(Matcher.java:905)
11.07 19:59:01 [Server] SEVERE at java.util.regex.Matcher.appendReplacement(Matcher.java:757)
11.07 19:59:01 [Server] SEVERE java.lang.NullPointerException