I'm sorry, i know that you aren't developing the mod, i just need help with a very particular issue...

[DDRAIGOCH117]

Hi, first of all i would like to apologize for my intromission in your repo that hasn't been updated in years. I humbly request your help with an issue i'm having while trying to include your mod in a modpack of mine. The issue comes as follows:

[18:09:17] [Netty Client IO #0/ERROR] [FML]: NetworkDispatcher exception
java.lang.IllegalArgumentException: Payload may not be larger than 32k
at net.minecraft.network.play.client.C17PacketCustomPayload.(SourceFile:38) ~[iz.class:?]
at cpw.mods.fml.common.network.internal.FMLProxyPacket.toC17Packet(FMLProxyPacket.java:120) ~[FMLProxyPacket.class:?]
at cpw.mods.fml.common.network.handshake.NetworkDispatcher.write(NetworkDispatcher.java:434) ~[NetworkDispatcher.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeWrite(DefaultChannelHandlerContext.java:644) ~[netty-all-4.0.10.Final.jar:?]
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:698) ~[netty-all-4.0.10.Final.jar:?]
at io.netty.channel.DefaultChannelHandlerContext.writeAndFlush(DefaultChannelHandlerContext.java:688) ~[netty-all-4.0.10.Final.jar:?]
at io.netty.channel.DefaultChannelHandlerContext.writeAndFlush(DefaultChannelHandlerContext.java:717) ~[netty-all-4.0.10.Final.jar:?]
at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:893) ~[netty-all-4.0.10.Final.jar:?]
at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:239) ~[netty-all-4.0.10.Final.jar:?]
at net.minecraft.network.NetworkManager$1.run(NetworkManager.java:174) [ek.class:?]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:354) [netty-all-4.0.10.Final.jar:?]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:348) [netty-all-4.0.10.Final.jar:?]
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [netty-all-4.0.10.Final.jar:?]
at java.lang.Thread.run(Thread.java:750) [?:1.8.0_422]

I have tried a lot of things, including installed "Bigger packets pls" to try to workaround this issue, but it just doesn't work. This issue arises in singleplayer whener i try to load a world. Since there is no crashlog, i cannot really put anything here besides the complete log:
fml-client-latest.log I hope you can help me orientate to the right direction to be able to fix this issue. Thanks in advance!