Uploaded my Codeigniter Project In Server, Throwing Error

Hi Need help in finding the solution for an issue. I have a codeigniter project which is working perfectly in Localhost but not in the client Server. It its Throwing an error

Fatal error: Call to undefined function mysqli_init() in /home/coursesandstay/public_html/coursesnstay/system/database/drivers/mysqli/mysqli_driver.php on line 126
A PHP Error was encountered
Severity: Warning
Message: Cannot modify header information - headers already sent by (output started at /home/coursesandstay/public_html/coursesnstay/system/database/drivers/mysqli/mysqli_driver.php:126)
Filename: core/Common.php
Line Number: 564
Backtrace:
A PHP Error was encountered
Severity: Error
Message: Call to undefined function mysqli_init()
Filename: mysqli/mysqli_driver.php
Line Number: 126
Backtrace:

Im Attaching the Screen Shot as well kindly help me in this. Thank You.

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