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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


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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.