Hello,
I started to not being able to run any PHP project on my Visual Studio Professional 2019 since a few days ago. The error is always the same "Value cannot be null. Parameter name: filePath" as you can see on the image 
I'm working on a Wordpress project and I use PHP Tools for Visual Studio to help me out with PHP.
Any idea on how to solve this problem? I really need this to be fix so I can continue developing in the project.
Best,
Mário Teixeira