I am validating the theme on localhost and am following the steps mentioned in the document.  I get an error when I activate  Revolution Slider.

Fatal error: Uncaught Error: Call to undefined function mysql_error() in /Applications/MAMP/htdocs/healthessentials/wp-content/plugins/revslider/inc_php/framework/db.class.php:29 Stack trace: #0 /Applications/MAMP/htdocs/healthessentials/wp-content/plugins/revslider/inc_php/framework/db.class.php(127): UniteDBRev->checkForErrors('fetch') #1 /Applications/MAMP/htdocs/healthessentials/wp-content/plugins/revslider/inc_php/revslider_params.class.php(42): UniteDBRev->fetch('wp_revslider_se...') #2 /Applications/MAMP/htdocs/healthessentials/wp-content/plugins/revslider/inc_php/revslider_operations.class.php(1274): RevSliderParams->getFieldFromDB('general') #3 /Applications/MAMP/htdocs/healthessentials/wp-content/plugins/revslider/settings/general_settings.php(52): RevOperations::getGeneralSettingsValues() #4 /Applications/MAMP/htdocs/healthessentials/wp-content/plugins/revslider/inc_php/framework/base_admin.class.php(346): require('/Applications/M...') #5 /Applications/MAMP/htdocs/healthessentials/wp-content/plugins/revslider/r in /Applications/MAMP/htdocs/healthessentials/wp-content/plugins/revslider/inc_php/framework/db.class.php on line 29

Yes I am already on a test host, let me set it up on a fresh instance. Would revert..!! Thanks.

It works now, please feel free to close..!!