improve error handling

nksrv/Program.cs

@@ -28,6 +28,8 @@ namespace nksrv
     internal class Program
     {
         static async Task Main()
+        {
+            try
             {
                 Logger.UnregisterLogger<ConsoleLogger>();
                 Logger.RegisterLogger(new GreatLogger());
@@ -46,8 +48,19 @@ namespace nksrv
                     server.RunAsync();
                 }).Start();
 
-            // cli interface
+                CliLoop();
+            }
+            catch(Exception ex)
+            {
+                Logger.Error("Fatal error:");
+                Logger.Error(ex.ToString());
+                Logger.Error("Press any key to exit");
+                Console.ReadKey();
+            }
+        }
 
+        private static void CliLoop()
+        {
             ulong selectedUser = 0;
             string prompt = "# ";
             while (true)