error in java

[qabeel]

I am have this error keep show to me in console of Battle ?
what fix for it need some help ?????

[05:55:10|ERROR|nioEventLoopGroup-2-1    |io.netty.util.ResourceLeakDetector             ] LEAK: ByteBuf.release() was not called before it's garbage-collected.Recent access records: 1#1:    io.netty.buffer.AdvancedLeakAwareByteBuf.writeBytes(AdvancedLeakAwareByteBuf.java:559)    io.netty.buffer.Unpooled.copiedBuffer(Unpooled.java:421)    ru.pb.battle.network.client.BattleClientConnection.channelRead0(BattleClientConnection.java:81)    ru.pb.battle.network.client.BattleClientConnection.channelRead0(BattleClientConnection.java:22)    io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:103)    io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:338)    io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:324)    io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785)    io.netty.channel.nio.AbstractNioMessageChannel$NioMessageUnsafe.read(AbstractNioMessageChannel.java:93)    io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:485)    io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:452)    io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:346)    io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101)    java.lang.Thread.run(Unknown Source)Created at:    io.netty.util.ResourceLeakDetector.open(ResourceLeakDetector.java:190)    io.netty.buffer.AbstractByteBufAllocator.toLeakAwareBuffer(AbstractByteBufAllocator.java:42)    io.netty.buffer.UnpooledByteBufAllocator.newDirectBuffer(UnpooledByteBufAllocator.java:55)    io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:155)    io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:146)    io.netty.buffer.Unpooled.directBuffer(Unpooled.java:127)    io.netty.buffer.Unpooled.copiedBuffer(Unpooled.java:417)    ru.pb.battle.network.client.BattleClientConnection.channelRead0(BattleClientConnection.java:81)    ru.pb.battle.network.client.BattleClientConnection.channelRead0(BattleClientConnection.java:22)    io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:103)    io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:338)    io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:324)    io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785)    io.netty.channel.nio.AbstractNioMessageChannel$NioMessageUnsafe.read(AbstractNioMessageChannel.java:93)    io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:485)    io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:452)    io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:346)    io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101)    java.lang.Thread.run(Unknown Source)