Error with classes and functions.

I really need help here im using unity on my laptop but used it on my desktop before I installed everything and am using visual studio. When I try to use classes and functions they don’t show up. Input.whatever it does not work I don’t understand why. I also don’t get when I make errors that I know are wrong the program does not catch the mistakes can someone help please?

To fix your problem follow this guide:

Getting Started with Visual Studio Tools for Unity | Microsoft Docs

Did you try regenerate your project files in Unity preferences?