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Access denied for user 'root'@'localhost' (using password: NO)

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i am receiving Access denied for user 'root'@'localhost' (using password: NO) how to solve it ? not in phpmyadmin in login form for admin wen i type the user name...

Fatal error: Uncaught Error: Call to undefined function mysql_connect() in C:\xampp\htdocs\online_voting\connection.php:3 Stack trace: #0 C:\xampp\htdocs\online_voting\admin\checklogin.php(13): require() #1 {main} thrown in C:\xampp\htdocs\online_voting\connection.php on line 3