Minecraft: Bukkit Server Fehler

Ich hab einen Bukkit Server auf meinem PC laufen um mit Freunden zu zocken. Aber immer wenn ein Spieler joint, kommt diese Fehlermedlung:
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18:03:18 [SCHWERWIEGEND] Could not pass event org.bukkit.event.player.PlayerJoin
Event to Plugins_info
java.lang.NullPointerException
        at me.Patrick_pk91.plugins.Plugins_info.permissions(Plugins_info.java:43
9)
        at me.Patrick_pk91.plugins.PluginsPlayerListener.onPlayerJoin(PluginsPla
yerListener.java:73)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:270)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:61)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:460)
        at net.minecraft.server.ServerConfigurationManager.c(ServerConfiguration
Manager.java:131)
        at net.minecraft.server.NetLoginHandler.b(NetLoginHandler.java:121)
        at net.minecraft.server.NetLoginHandler.a(NetLoginHandler.java:87)
        at net.minecraft.server.Packet1Login.handle(Packet1Login.java:70)
        at net.minecraft.server.NetworkManager.b(NetworkManager.java:226)
        at net.minecraft.server.NetLoginHandler.a(NetLoginHandler.java:47)
        at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:6
1)
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:537)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:435)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)

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Aber der Server läuft sonst flüssig und alles funktioniert..