Fatal error: Uncaught mysqli_sql_exception: Duplicate entry 'nandhu' for key 'users.username' in /home/dataextractorpro/public_html/blog/includes/db.php:18 Stack trace: #0 /home/dataextractorpro/public_html/blog/includes/db.php(18): mysqli_stmt->execute() #1 /home/dataextractorpro/public_html/blog/router.php(5): include('/home/dataextra...') #2 {main} thrown in /home/dataextractorpro/public_html/blog/includes/db.php on line 18