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[1.16.1] Mod won't work in server environment


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Hi y'all,

I'm reaching out because I'm truly at a loss on why this isn't working. I just built my mod on 1.16.1 for the first time to test with my friend, but neither of us can connect, getting booted on join. I have narrowed it down to being an issue with my mod, as we can join a Forge server with no mods on it. The connection in-game shows:

Internal Exception: io.netty.handler.codec.DecoderException: io.netty.handler.codec.EncoderException: java.io.UTFDataFormatException: malformed input around byte 83


However I cannot find this in either server or client log at all. Any advice on this issue?


Server Log


Client Log




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15 hours ago, diesieben07 said:

Start the Forge server with -Dforge.logging.mojang.level=DEBUG. Then the exception should be logged to debug.log.

I confirmed that this log provides the same info when it matters, upon player join. Nothing additional could be learned from adding this. The paste is too large to post.

Edited by Haydenman2


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8 hours ago, diesieben07 said:

I derped, you receive this error message on the client, right? Then the VM argument needs to be on the client of course. Sorry.

Thank you! Thank you very much. I appreciate your advice and using it I can now diagnose myself using the stack trace. Thank you again. :)


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