What is the Ingame name?
Take a screenshot.
I solved the problem! My friend had different nicknames at launcher and his profile in Tlauncher.org
Thank you a lot!!!
Posts by iincaendium
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That issue typically appears if the chosen in-game name is invalid and does not comply with Mojang's username restrictions: https://help.minecraft.net/hc/…36712-Minecraft-Usernames
No, it didn't helped
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Me and my friends all over the world are trying to connect, and the only friend that can't connect has mac and it has this error:
Internal Exception: io.netty.handler.codec.DecoderException:java.lang.IndexOutOfBoundsException: Index:25, Size: 5
We are playing with T-launchers. Its okay with Windows.