Fatal error: Uncaught Error: Call to undefined function wp_create_nonce() in /home/guruspen/public_html/wp-content/plugins/user-rewards-system/includes/class-authentication.php:20
Stack trace:
#0 /home/guruspen/public_html/wp-content/plugins/user-rewards-system/user-rewards-system.php(165): URS_Authentication->__construct()
#1 /home/guruspen/public_html/wp-settings.php(545): include_once('/home/guruspen/...')
#2 /home/guruspen/public_html/wp-config.php(102): require_once('/home/guruspen/...')
#3 /home/guruspen/public_html/wp-load.php(50): require_once('/home/guruspen/...')
#4 /home/guruspen/public_html/wp-blog-header.php(13): require_once('/home/guruspen/...')
#5 /home/guruspen/public_html/index.php(17): require('/home/guruspen/...')
#6 {main}
  thrown in /home/guruspen/public_html/wp-content/plugins/user-rewards-system/includes/class-authentication.php on line 20