Proper handling and logging of errors during the execution of a plugin

src/DesktopMagic/Plugin/PluginWindow.xaml.cs

@@ -191,13 +191,6 @@ namespace DesktopMagic
                 return;
             }
 
-            if (instanceType.Namespace == nameof(DesktopMagic))
-            {
-                MessageBox.Show("NO!", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
-                Exit();
-                return;
-            }
-
             LoadOptions(instance);
 
             valueTimer = new System.Timers.Timer();
@@ -254,18 +247,32 @@ namespace DesktopMagic
             System.Drawing.Color color = newBrush.Color;
             string font = MainWindow.GlobalFont;
 
+            try
+            {
                 Bitmap result = pluginClassInstance.Main();
 
                 if (pluginClassInstance.UpdateInterval > 0)
                 {
                     valueTimer.Interval = pluginClassInstance.UpdateInterval;
                 }
+                else
+                {
+                    valueTimer.Stop();
+                }
 
                 //Update Image
                 Dispatcher.Invoke(() =>
                 {
                     image.Source = BitmapToImageSource(result);
                 });
+            }
+            catch (Exception ex)
+            {
+                MainWindow.Logger.Log(ex.ToString(), "Plugin");
+                MessageBox.Show("File execution error:\n" + ex, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
+                Exit();
+                return;
+            }
 
             if (stop)
             {