I created an empty c++ file. and I can’t enter the project anymore and I can’t build through visual studio.
When i press yes “SteamSession could not be compiled. Try rebuilding from source manually.”
All you did was add a c++ file? That’s all? If that’s the case, it should build. Right click on the top file (‘SteamSession,’ under the Games folder) and select Rebuild. That should work, unless something odd is going on. You may also want to close the Unreal editor, if it isn’t already closed, and make sure your antivirus isn’t creating any mischief.
Ridiculously, it was due to a plugin I threw into the engine yesterday, I deleted it and everything was fine.