Hello,When upgrading from 1.7.7 to any version of 1.8.x, I get blank pages when accessing any page.This occurs when upgrading via Softaculous (cPanel) or when manually uploading files.I enabled error reporting and receive the following error:Fatal error: Call to undefined function mysqli_init() in /.../include/mysqli.php on line 28Any help would be much appreciated. Thanks in advance!