Sudden Error on the Forum Site

I suddenly got an error on my forum. Any idea what went wrong ?


Code:

Fatal error: Uncaught Error: Call to undefined function mysqli_init() in /home1/saptak/forums.webprotime.com/src/XF/Db/Mysqli/Adapter.php:152 Stack trace: #0 /home1/saptak/forums.webprotime.com/src/XF/Db/Mysqli/Adapter.php(28): XF\Db\Mysqli\Adapter->makeConnection(Array) #1 /home1/saptak/forums.webprotime.com/src/XF/Error.php(85): XF\Db\Mysqli\Adapter->getConnection() #2......

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source https://xfworld.net/threads/sudden-error-on-the-forum-site.47819/