500 | PAGE ERROR OCCUR

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E_ERROR 1
File: '/home/lihsuncom/public_html/assets/class/DBConnection.php'
Line: 49
Content:
Uncaught Error: Call to undefined function mysql_connect() in /home/lihsuncom/public_html/assets/class/DBConnection.php:49 Stack trace: #0 /home/lihsuncom/public_html/config/Global.php(59): DBConnection->connect() #1 /home/lihsuncom/public_html/config/User.php(2): require('/home/lihsuncom...') #2 /home/lihsuncom/public_html/index.php(2): require('/home/lihsuncom...') #3 {main} thrown