Widgets and Visual Editor not working Wordpress

Sometimes this is happen when we update the version of the wordpress or add some new plugin in our
wordpress site, some part of our admin area stop the working like Editor or Widgets etc.

To overcomes that problem you can simply put following code on your wp-config.php just under
define('DB_COLLATE', '');

define( 'CONCATENATE_SCRIPTS', false ); 

so our new code becomes like :

define('DB_COLLATE', '');

define( 'CONCATENATE_SCRIPTS', false );   

 in the wp-config.php that is location  on root of the wordpress site.