diff --git a/lib/client/dom.js b/lib/client/dom.js
index 14f9c01f..f4fbc556 100644
--- a/lib/client/dom.js
+++ b/lib/client/dom.js
@@ -179,10 +179,10 @@ var CloudCmd, Util, DOM, CloudFunc, Dialog;
                 var ret, classList;
                 
                 if (!element)
-                    throw(Error('element could not be empty!'));
+                    throw Error('element could not be empty!');
                 
                 if (!className)
-                    throw(Error('className could not be empty!'));
+                    throw Error('className could not be empty!');
                 
                 classList   = element.classList;
                 ret         = classList.contains(className);
@@ -1272,7 +1272,7 @@ var CloudCmd, Util, DOM, CloudFunc, Dialog;
                     
                 
                 if (!panel)
-                    throw(Error('can not find Active Panel!'));
+                    throw Error('can not find Active Panel!');
                     
                 return panel;
             };