Code after update always highlighted as erro

Unity Engine
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1

After i updated to unity 2020.1.8f1, all code a write, is highlighted as error in Visual Studio 2019
is this a know issue ?

2

Make sure Visual Studio is still set properly as your external editor in Unity settings.

3

I just checked and still is the external script editor.
I just made a test using the 2019.4.12 is working well.

4

Try shutting down Unity and Visual Studio, then deleting your project’s Library folder, and opening everything back up.

5

This worked. Thanks a lot