b80, error I get when trying to buy cobblestone


12:07:03 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'shop' in plugin LocalShops v4.0.0dev-b80
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:37)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:129)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:352)
	at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:737)
	at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:701)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:694)
	at net.minecraft.server.Packet3Chat.a(Packet3Chat.java:33)
	at net.minecraft.server.NetworkManager.b(NetworkManager.java:226)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:89)
	at net.minecraft.server.NetworkListenThread.a(SourceFile:105)
	at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:454)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:363)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)
Caused by: java.lang.NullPointerException
	at net.milkbowl.vault.permission.plugins.Permission_Permissions3.playerHas(Permission_Permissions3.java:273)
	at net.milkbowl.vault.permission.Permission.has(Permission.java:68)
	at net.milkbowl.localshops.commands.Command.canUseCommand(Command.java:103)
	at net.milkbowl.localshops.commands.CommandShopBuy.process(CommandShopBuy.java:72)
	at net.milkbowl.localshops.commands.ShopCommandExecutor.onCommand(ShopCommandExecutor.java:124)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:35)
	... 12 more