A couple of small last minute bug fixes.

ProtocolLib/src/main/java/com/comphenix/protocol/CommandPacket.java

@@ -260,7 +260,7 @@ class CommandPacket extends CommandBase {
 			if (subCommand == SubCommand.ADD) {
 				// The add command is dangerous - don't default on the connection side
 				if (args.length == 1) {
-					sender.sendMessage(ChatColor.RED + "Please specify a connectionn side.");
+					sender.sendMessage(ChatColor.RED + "Please specify a connection side.");
 					return false;
 				}
 				

ProtocolLib/src/main/java/com/comphenix/protocol/events/PacketContainer.java

@@ -595,7 +595,7 @@ public class PacketContainer implements Serializable {
 	 * Retrieve a read/write structure for the NativeGameMode enum in 1.7.2.
 	 * @return A modifier for NativeGameMode enum fields.
 	 */
-	public StructureModifier<NativeGameMode> getGamemodes() {
+	public StructureModifier<NativeGameMode> getGameModes() {
 		// Convert to and from the wrapper
 		return structureModifier.<NativeGameMode>withType(
 				EnumWrappers.getGameModeClass(), EnumWrappers.getGameModeConverter());

ProtocolLib/src/main/java/com/comphenix/protocol/wrappers/EnumWrappers.java

@@ -66,9 +66,9 @@ public abstract class EnumWrappers {
 	/**
 	 * Initialize the wrappers, if we haven't already.
 	 */
-	private static boolean initialize() {
-		if (MinecraftReflection.isUsingNetty())
-			return false;
+	private static void initialize() {
+		if (!MinecraftReflection.isUsingNetty())
+			throw new IllegalArgumentException("Not supported on 1.6.4 and earlier.");
 		
 		PROTOCOL_CLASS = getEnum(PacketType.Handshake.Client.SET_PROTOCOL.getPacketClass(), 0);
 		CLIENT_COMMAND_CLASS = getEnum(PacketType.Play.Client.CLIENT_COMMAND.getPacketClass(), 0);
@@ -83,7 +83,6 @@ public abstract class EnumWrappers {
 		associate(DIFFICULTY_CLASS, Difficulty.class, getDifficultyConverter());
 		associate(ENTITY_USE_ACTION_CLASS, EntityUseAction.class, getEntityUseActionConverter());
 		associate(GAMEMODE_CLASS, NativeGameMode.class, getGameModeConverter());
-		return true;
 	}
 	
 	private static void associate(Class<?> nativeClass, Class<?> wrapperClass, EquivalentConverter<?> converter) {