improve error message, hide realpath of layout file

controller/Controller.php

@@ -47,7 +47,11 @@ Class Controller {
 
             ob_end_flush();
         }else {
-            throw new Exception("Layout file not exist: {$layoutFile}", 500);
+            $error_message = "Layout file {$this->layout}.php is not exist.";
+            if (!empty(FSC::$app['config']['theme'])) {
+                $error_message = "Layout file {$this->layout}.php in theme " . FSC::$app['config']['theme'] . " is not exist.";
+            }
+            throw new Exception($error_message, 500);
         }
     }
 

lib/FSC.php

@@ -98,9 +98,9 @@ Class FSC {
                 throw new Exception($error_message, 500);
             }
         }else {
-            $error_message = "Controller {$className} not exist.";
+            $error_message = "Controller {$className}.php not exist.";
             if (!empty($config['theme'])) {
-                $error_message = "Controller {$className} not exist in theme {$config['theme']}.";
+                $error_message = "Controller {$className}.php not exist in theme {$config['theme']}.";
             }
             throw new Exception($error_message, 500);
         }