It always says that
I can't join my server anymore because of it

NetworkDispatcher exception
io.netty.handler.codec.EncoderException: String too big (was 39118 bytes encoded, max 32767)
at net.minecraft.network.PacketBuffer.func_180714_a(PacketBuffer.java:400) ~[gy.class:?]
at net.minecraft.network.PacketBuffer.func_179256_a(PacketBuffer.java:181) ~[gy.class:?]
at net.minecraft.network.play.server.SPacketChat.func_148840_b(SourceFile:35) ~[in.class:?]
at net.minecraft.network.NettyPacketEncoder.encode(NettyPacketEncoder.java:51) ~[ha.class:?]
at net.minecraft.network.NettyPacketEncoder.encode(NettyPacketEncoder.java:12) ~[ha.class:?]
at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107) ~[minecraft_server.1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:738) ~[minecraft_server.1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:730) ~[minecraft_server.1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:816) ~[minecraft_server.1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:723) ~[minecraft_server.1.12.2.jar:?]
at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.write(NetworkDispatcher.java:548) ~[NetworkDispatcher.class:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:738) ~[minecraft_server.1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:801) ~[minecraft_server.1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:814) ~[minecraft_server.1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:794) ~[minecraft_server.1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:831) ~[minecraft_server.1.12.2.jar:?]
at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1032) ~[minecraft_server.1.12.2.jar:?]
at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:296) ~[minecraft_server.1.12.2.jar:?]
at net.minecraft.network.NetworkManager$4.run(NetworkManager.java:245) [gw$4.class:?]
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) [minecraft_server.1.12.2.jar:?]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:403) [minecraft_server.1.12.2.jar:?]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:442) [minecraft_server.1.12.2.jar:?]
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858) [minecraft_server.1.12.2.jar:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_161]
[20:04:43] [Server thread/INFO] [mcjty.lib.varia.Logging]: SMP: Player logged in: Sync diminfo to clients

Duplicate of #303

thanks

Something you had on you are near you was carrying too many items/too many different items. This is generally caused by things such as having several bags full of stuff, holding ME drives, putting ME drives in bags, holding full storage containers with a moving wand/sack of holding. Essentially some block near/on you has too much data.