The type or namespace name 'Newtonsoft' could not be found

Good day.

Please tell me what I'm doing wrong.

 

Added to the package's .csproj file



             $(CoreLibPath)\Newtonsoft.Json.dll

             False

             false



 

I use in the code:

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

 

But when publishing, the system gives me:

The type or namespace name 'Newtonsoft' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'Newtonsoft' could not be found (are you missing a using directive or an assembly reference?)