Problem with namespace

Hi I using Unity 2019.4.10f1. I have a problem with not found namespace. I installed UniRx plugin and put this code to Assets/Plugins/UniRx. Unity Editor reports no errors but in Visual Studio Code or Rider i have e problem with not fount namespace UniRx. I rebuild the whole project but it didn’t help either

Anyone have any idea how to solve this?

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Welcome!

You probably just need to regenerate your project files. Also try closing your code editor and selecting Assets → Open C# Project from within Unity and see if that helps.

The same