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When i join a lobby in wireless game in Mario kart 8 version 2.2.1 with the Booster Course DLC Wave 1, 2, 3 installed there appear this POST title error; how to fix it my yuzu main screen looks like this


In order for us to provide better support, we need to see the log generated by yuzu. This guide will walk you through how you can obtain the log file: Getting Log Files - yuzu

It could be that the lobby is already playing. Try either later, or start your own room.