package oe.packet;

import net.minecraft.network.INetworkManager;
import net.minecraft.network.packet.Packet250CustomPayload;
import cpw.mods.fml.common.network.IPacketHandler;
import cpw.mods.fml.common.network.Player;

public class PacketHandler implements IPacketHandler {
  
  @Override
  public void onPacketData(INetworkManager manager, Packet250CustomPayload packet, Player playerEntity) {
    System.out.println(packet.channel);
    if (packet.channel == "oe" || packet.channel == "OE") {
      InternalPacket.packet(manager, packet, playerEntity);
    }
  }
  
}

package oe.packet;

import net.minecraft.network.INetworkManager;
import net.minecraft.network.packet.Packet250CustomPayload;
import cpw.mods.fml.common.network.IPacketHandler;
import cpw.mods.fml.common.network.Player;

public class PacketHandler implements IPacketHandler {
  
  @Override
  public void onPacketData(INetworkManager manager, Packet250CustomPayload packet, Player playerEntity) {
    if (packet.channel == "oe" || packet.channel == "OE") {
      InternalPacket.packet(manager, packet, playerEntity);
    }
  }
  
}

Remove Debug code in packet handler
Remove Debug code in packet handler
