Can you make sure that your project is set as the startup project inside Visual Studio. You can do this by right clicking on the project name and selecting “Set as StartUp Project” about halfway down the list of options. If that doesn’t work, let me know if you’re able to open the project by double clicking on the .uproject file or what error you get if that fails.
Was the project created using the Launcher or a source engine version? Additionally, please try building the project for Development Editor and then try to open the project. If that doesn’t work, let me know if you’re able to create/open a new code project from the Launcher.