Wrong version of .NET Core in one of the projects

Books.ConsoleApp/BooksByAuthor.cs

@@ -0,0 +1,16 @@
+using System.Collections.Generic;
+
+namespace Books.ConsoleApp
+{
+    public class BooksByAuthor
+    {
+        public readonly string Author;
+        public readonly List<Book> Books;
+
+        public BooksByAuthor(string author, List<Book> books)
+        {
+            Author = author;
+            Books = books;
+        }
+    }
+}