Problem on Preview

Hi all,

Moving website from Deluxe hosting plan to Ultimate hosting plan – Godaddy

It went through without problem. However on Preview it popup;

Fatal error: Call to undefined function wp_register_plugin_realpath() in /home/gopublic2014/public_html/cuisine/wp-settings.php on line 213

wp-settings.php
line 213 wp_register_plugin_realpath( $plugin );

found “Symlinked Plugins in WordPress 3.9”
http://make.wordpress.org/core/2014/04/14/symlinked-plugins-in-wordpress-3-9/

but couldn’t resolve where to enter;

<?php
$plugins = array(
    'my-mu-plugin/my-mu-plugin.php',
);
foreach ( $plugins as $plugin ) {
    $path = dirname( __FILE__ ) . '/' . $plugin;

    // Add this line to ensure mu-plugins subdirectories can be symlinked
    wp_register_plugin_realpath( $path );

    include $path;
}

How to change ( $path ) ?

Please help. Thanks

Rgds
satimis