The Internal Exception Java.IO.IOException error usually occurs when you launch Minecraft, or when the game is underway. This error can be caused by a number of different things.

Unlike previous versions, Minecraft server software now relies on the latest version of Java (Java 16) in order to function correctly.

Having trouble with this error in Minecraft? Here are ways to fix it.

Make sure your JAVA client matches your operating system (32 or 64bit) and re-install respective version of JAVA client. 2# Minecraft – Low Performance, Low FPS, Frame Drops Mod your game with ...

If you see Failed to connect to the server, Connection timed out no further information error on Minecraft, this guide has working solutions to fix it.