So my friend created this mine with the minecarts and minecart assembly but now whenever were nearby it kicks the nearby players. The error is always says 'Internal Exception: io.netty.handler.codec.DecoderException:io.netty.handler.codec.EncoderExcpetion: java.io.EOFException:fieldSize is too long! Length is 2, but maximum is 0'

I can second having this error, identical error, and is quite problematic as I as the server admin cannot log into my server now.

We are also having this error, after some testing we figured out that the minecarts work on north/south but cause crashing on west/east. We also figured out that after we switched out files for that local server the problem persisted and we concluded that it may be client side.

Here is a showcase of what exactly happens.

My mc log: https://pastebin.com/DFKJ6V5L
Console just shows: "Disconnected"
Video of what happens(too big for github): https://youtu.be/pGfILVUisg8
If you wanna try it out for yourself on my server feel free to pm me on discord. My id: cow0075#1059

I have encountered this same issue in the modpack Valhelsia 3.

The log file is here: https://pastebin.com/3F4hQETT, but has nothing useful; the only message relating to the error is [10:36:10] [Netty Epoll Client IO #0/ERROR] [minecraft/ArgumentTypes]: Could not deserialize minecraft:. The disconnection screen shows Internal Exception: io.netty.handler.codec.DecoderException: java.lang.ArrayIndexOutOfBoundsException: 6.

Without any backtrace information available, I don't think I can debug this farther, but it appears to be reproducible.

Further information, I made a tunnel boring machine, no error. When I placed down a furnace cart to push it then the game immediately errored out with OG error. Tested again with Transports powered modular cart and it happened again, so seems to be related to having a second cart pushing the contraption.

For reference to anyone trying to clear the bug, as long as you're on a server, type "/kill @e[type=minecart]" in the console as you try to log in (to load the carts chunk), may need to try it a few times to get the timing right.

None of my contraptions have been two cart. They have been on the larger side, 4 by 4 drills with deployers to fill in sides of tunnel, and it seems like once I've had the error contraptions that were fine, even single block assembler in cart contraptions then cause the crash. Unfortunately I haven't been able to find any trace of the issue in logs anywhere.

Me and my friend have the same error on our server, cant create a minecart contraption without getting kicked. With the 0.3a only he got kicked but then we tried the devbuild and both of us got infinitely kicked

EDIT: Server was complaining about ForgeEndertech so we removed it, all works fine and dandy now!

I'm not a developer but I can guess that it probably is erroring only on 2 minecart contraptions because they have more NBT data needed to be stored, so the question really is what's causing this large amount of NBT data, which is exceeding the limit.

This happened to me tonight as well. It does appear to only be happening on one axis as well. Did anyone find a solution to remove the said created entity? I haven't had any luck and it doesn't appear to be creating a crash report

If you are in a server, you could do kill @e[type=minecart] from console.

Thanks! I'll give that a shot

I was only able to get it to work by having someone run the command the second it said I logged in. But ty @SamL2020 for the tip.

Yeah the chunks have to be loaded for the server to kill the cart.

This was addressed in 0.3c, feel free to re-open if its still an issue. Cheers~