Ported libs fo net V6

HaWeb/Controllers/ErrorController.cs

@@ -0,0 +1,14 @@
+using System.Diagnostics;
+using Microsoft.AspNetCore.Mvc;
+using HaWeb.Models;
+
+namespace HaWeb.Controllers;
+
+
+public class ErrorController : Controller
+{
+    [Route("Error404/")]
+    public IActionResult ErrorNotFound() {
+        return View();
+    }
+}