2013-05-06 22:06:05 [WARNING] Invalid material: WEB
2013-05-06 22:06:05 [SEVERE] Could not pass event BlockPlaceEvent to WGBlockRestricter v1.6.2
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:342)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:39)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:479)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:464)
	at org.bukkit.craftbukkit.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:107)
	at net.minecraft.server.ItemBlock.processBlockPlace(ItemBlock.java:85)
	at net.minecraft.server.ItemBlock.interactWith(ItemBlock.java:71)
	at net.minecraft.server.ItemStack.placeItem(ItemStack.java:80)
	at net.minecraft.server.PlayerInteractManager.interact(PlayerInteractManager.java:391)
	at net.minecraft.server.PlayerConnection.a(PlayerConnection.java:643)
	at net.minecraft.server.Packet15Place.handle(SourceFile:58)
	at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:192)
	at net.minecraft.server.PlayerConnection.d(PlayerConnection.java:121)
	at net.minecraft.server.ServerConnection.b(SourceFile:35)
	at org.spigotmc.MultiplexingServerConnection.b(MultiplexingServerConnection.java:73)
	at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:589)
	at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:223)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:476)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:408)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to java.util.HashSet
	at com.mewin.WGBlockRestricter.Utils.blockAllowedInRegion(Utils.java:112)
	at com.mewin.WGBlockRestricter.Utils.blockAllowedAtLocation(Utils.java:60)
	at com.mewin.WGBlockRestricter.BlockListener.onBlockPlace(BlockListener.java:68)
	at sun.reflect.GeneratedMethodAccessor543.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:340)
	... 20 more