Need to add in function.php in theme

function register_my_session(){
if( ! session_id() ) {
session_start();
}
}

add_action(‘init’, ‘register_my_session’);

wp_register_script( ‘jQuery’, “https://cdnjs.cloudflare.com/ajax/libs/jquery.inputmask/5.0.6/jquery.inputmask.min.js”, null, null, true );
wp_enqueue_script(‘jQuery’);

wp_register_script(‘custom-js’,WP_PLUGIN_URL.’/custom/custom.js’,array(),NULL,true);
wp_enqueue_script(‘custom-js’);

$wnm_custom = array( 'template_url' => get_bloginfo('template_url') );
wp_localize_script( 'custom-js', 'wnm_custom', $wnm_custom );