Adding Xunit for asp.net core application

Good afternoon dear friends, could you tell me what I am doing wrong? I have Asp.net core webb application and use VS Code, I tried to add xunit directory for testing my application but finally I got this: enter image description here My application cannot see Xunit even when I 'using' it

My algorithm of adding xunit:

1. Manually create directory UnitTests
2. Use in command line command 'dotnet new xunit'

And finall I got mistake...