unexpected custom data from client?

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    my friend wanted to join my server but it shows him unexpected custom data from client. how can you fix that? we have been playing normally before, we left for a few months and now this happened

    Edit: my friend also says the tlauncher symbol on his versions is grey

    Ask your friend to share his client log


    1. open your minecraft installation path
    (enter %appdata%/.minecraft in the file explorer )
    2. open the logs folder
    3. open the "latest" or "latest.log" file with a text editor
    4. copy and paste the content of the file to https://mclo.gs/
    5. send the link here

    :aternos: Hello Everyone :aternos: