Hi,
Hope you’re doing well.
Welcome to the forum, by the way!
Thanks for the provided information, don’t worry about that error, it’s very comom, we just have to build you game from visual studio, maybe some code you’ve used in 5.5 is not available in 5.6.
Try the following step.
Note: if you’re getting an error at step 6, simply check if your game project is set as the default startup in the Solution Explorer — it should be highlighted.
If it’s not, right-click on it and choose “Set as Startup Project.”
You can find more details in this post/thread: Unreal engine 5.5.4 not working with Visual Studio 2022 - #2 by SpecZynk
After STEP 6 succeed, Visual Studio will try to compile. If it succeeds, the engine will launch automatically. Otherwise, you’ll see an error in the compile output.
You can try fixing it yourself, or feel free to post it here so we can solve it together.
Hope that helps — take care!