fix minecraft internal exception java.lang.illegalstateexception invalid characters in username

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Troubleshooting Methods to Fix the Minecraft Error Internal exception: java. io. ioexception
1.Reboot Your Internet Router.
2.Reboot Your Computer/Device.
3.Reinstall a Fresh Copy of Minecraft.
4.Temporarily Disable Windows Defender.
5.Add Minecraft to the Windows Defender Whitelist.
6.Allow Minecraft Through the Firewall.

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minecraft internal exception

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#minecraft
#internalexception
#java
#invalidcharacters
#username

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[suiexsilium]

Thanks! I'm playing on TLauncher and I had a long username with a space in between the names. When I changed it to one name only, it fixed it! Thanks!