diff --git a/PrecastConcretePlant/PrecastConcretePlantView/Program.cs b/PrecastConcretePlant/PrecastConcretePlantView/Program.cs
index d8549dd..5836a8f 100644
--- a/PrecastConcretePlant/PrecastConcretePlantView/Program.cs
+++ b/PrecastConcretePlant/PrecastConcretePlantView/Program.cs
@@ -90,6 +90,6 @@ namespace PrecastConcretePlantView
             DependencyManager.Instance.RegisterType<FormImplementer>();
             DependencyManager.Instance.RegisterType<FormViewMail>();
         }
-        private static void MailCheck(object obj) => ServiceProvider?.GetService<AbstractMailWorker>()?.MailCheck();
+        private static void MailCheck(object obj) => DependencyManager.Instance.Resolve<AbstractMailWorker>()?.MailCheck();
     }
 }
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