Compile error showing in unity, not showing in Visual Studio

Unity Engine
4

Unity is what counts… Visual Studio might not be fully up to date with your project, or there could be another issue.

This may help you with intellisense and possibly other Visual Studio integration problems:

Sometimes the fix is as simple as doing Assets → Open C# Project from Unity. Other times it requires more.

https://discussions.unity.com/t/778503

Also, try update the VSCode package inside of Unity: Window → Package Manager → Search for Visual Studio Code Editor → Press the Update button

Also, this: https://discussions.unity.com/t/805330/7