Autopayment bukkit

payment group create ADMIN 1000
12:51:47 [WARNING] Unexpected exception while parsing console command "payment group create ADMIN 1000"
org.bukkit.command.CommandException: Unhandled exception executing command 'payment' in plugin AutoPayments v6
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:192)
        at org.bukkit.craftbukkit.v1_6_R3.CraftServer.dispatchCommand(CraftServer.java:532)
        at org.bukkit.craftbukkit.v1_6_R3.CraftServer.dispatchServerCommand(CraftServer.java:519)
        at net.minecraft.server.v1_6_R3.DedicatedServer.as(DedicatedServer.java:276)
        at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:241)
        at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:483)
        at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:415)
        at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.NullPointerException
        at net.milkbowl.vault.permission.Permission.has(Permission.java:109)
        at com.bs.java.plugin.autopayments.Permissions.checkPerms(Permissions.java:38)
        at com.bs.java.plugin.autopayments.Commands.onCommand(Commands.java:67)
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
        ... 8 more